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Results for COSC

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Chronometer (COSC)

The Swiss accuracy certification at -4/+6 s/day across 15 days.

Dimensions · Guide
Case dimensions: Bulgari Octo Finissimo Ultra COSC Bulgari

40 mm × 1.85 mm, lug integrated, Cal. BVL 180

Introducing - The new Formex Reef 39.5mm Bahama Blue Automatic COSC Monochrome
Formex Reef 39.5mm Bahama Blue Jun 11, 2024

Introducing - The new Formex Reef 39.5mm Bahama Blue Automatic COSC

The “Baby Reef” series of Formex 39.5mm dive watches, comprised of four watches distinguished by dial colour, was presented at the end of 2023. Now, in time for summer, it gets a new and very fresh-looking reference. It’s everything the brand enthusiasts appreciate about the collection, only brighter. Here’s the Reef 39.5mm Bahama Blue 300m […]

A Technical Perspective - All About Omega’s Laboratoire de Précision, a new Chronometer Certification to compete with COSC, Open to all Brands Monochrome
Omega s Laboratoire de Précision May 17, 2024

A Technical Perspective - All About Omega’s Laboratoire de Précision, a new Chronometer Certification to compete with COSC, Open to all Brands

Omega is one of the largest luxury watchmakers on the market, carrying multiple emblematic models (Seamaster and Speedmaster, to name a few). However, one vital element of the brand’s success lies in its almost unique take on precision. Omega has long been a pioneer in this field, often ranking first in chronometry contests and introducing […]

Introducing - By Popular Demand, The Smaller Formex “Baby Reef” 39.5mm Automatic COSC 300M Monochrome
Formex Baby Reef” 39.5mm Automatic Dec 7, 2023

Introducing - By Popular Demand, The Smaller Formex “Baby Reef” 39.5mm Automatic COSC 300M

When released in 2020, the 42mm Formex Reef Automatic Chronometer 300M impressed enthusiasts, demonstrating a fusion of innovation and design sophistication in a highly functional tool watch. Fresh and unique, the watch offered a compelling array of features and extensive customization options. Today, just like it did with the Essence collection a few years ago, […]

Exclusive: TAG Heuer To Introduce A COSC Certified Flying Tourbillon Chronograph For Under 20,000CHF (14,900CHF !!!) Revolution
TAG Heuer Mar 22, 2015

Exclusive: TAG Heuer To Introduce A COSC Certified Flying Tourbillon Chronograph For Under 20,000CHF (14,900CHF !!!)

Today, recently appointed General Manager of TAG Heuer, Guy Semon dropped a bombshell on the Revolution team with news of an upcoming watch that certainly is a provocative statement of intent. We at Revolution love our watches, and the passing parade of the best that the Swiss watch industry has to offer is by no means something […]

Introducing: The Breitling Navitimer B09 Chronograph 41 Miles Davis Hodinkee
Breitling Navitimer B09 Chronograph 41 13h ago

Introducing: The Breitling Navitimer B09 Chronograph 41 Miles Davis

What We Know In honor of the centennial of legendary musician Miles Davis' birth, Breitling has just announced a limited edition collection at Geneva Watch Days. I say collection because it's more than just one watch, if you want it to be. At the core, Breitling has launched a 500-piece limited-edition model, the steel Navitimer B09 Chronograph 41 Miles Davis, which is inspired by the ref. 806 Mk 5 Navitimer that was worn by the famous jazz musician. If a single steel option isn't enough for you Davis heads out there, Breitling is also producing 50 three-piece sets that offer a trio of executions of the watch, spanning steel, yellow gold, and even platinum with a blue dial.  We can start with the core model, reference AB09501A1B1X1 or AB09501A1B1A1, depending on whether you want a leather strap or the bracelet (you want the bracelet). Measuring 41mm wide (the same as the reference worn by Davis), 13mm thick, and 47.1 mm lug-to-lug, the Navitimer Miles Davis uses a Breitling B09 hand-wound movement that is COSC-certified, ticks at 4 Hz, and employs both a column wheel and a vertical clutch. Water resistance is 30 meters, and this special edition sports both cream-colored lume and Breitling's (very cool) Twin Jet logo.  And then there is the bracelet, a modern interpretation of the Air Racer bracelet that uses a cuff design with large holes. For this execution, Breitling has added hinged links near the clasp to help with comfort. But that's not all; aside from a gorgeous...

Tudor’s 100th Anniversary Celebration Continues with the Return of the North Flag Worn & Wound
Tudor s 100th Anniversary Celebration Yesterday

Tudor’s 100th Anniversary Celebration Continues with the Return of the North Flag

We knew some big moments would come as Tudor notches its impressive 100th anniversary as a brand this year, and this is one of them: the revival of the North Flag. The aptly named collection has come to serve as the north star for Tudor’s modern offerings and set the tone for the brand in the past decade. When the model first debuted in 2015, it marked the first Tudor watch to house an in-house movement coupled with an exhibition caseback to show it off. The COSC-certified Caliber MT5621 that powered the original was just the jumping off point for Tudor to upgrade models across its catalog with manufacture movements and chronometer certification. Now, in the newly revived North Flag line, we get even greater attention on technical capabilities with METAS certification, giving it Master Chronometer status, as well as the addition of a GMT complication.Despite the advancements we’ve seen throughout the North Flag collection and in the newest edition today, the model remains deeply rooted in Tudor’s history and makes for a fitting addition to its 100th anniversary offerings. The Ranger II from 1973 has served as the historic touchpoint for the collection since its inception. There are several key design codes that create a throughline from the Ranger II to the original North Flag and now the latest edition. These include the black dial with large Arabic numeral hour markers, the arrow-shaped 24-hour and hours hands coupled with an angular seconds hand and a baton-shaped...

Introducing: Chopard L.U.C. 1963 Heritage Regulator And L.U.C 1963 Heritage Chronograph Limited Editions Hodinkee
Chopard L.U.C 1963 Heritage Regulator Yesterday

Introducing: Chopard L.U.C. 1963 Heritage Regulator And L.U.C 1963 Heritage Chronograph Limited Editions

What We Know While not a part of Geneva Watch Days (which starts this week), Chopard is preempting the show a bit with two new 25-piece limited editions in their L.U.C. line—the brand's in-house haute horlogerie division. The first up (and more expensive of the two) is the L.U.C. 1963 Heritage Regulator, a 40mm by 10.3mm watch in 18k ethical white gold with 30m water resistance. The dial—which conveys hours (in a subdial), regulator-style minutes, GMT, power reserve, running seconds, and date—is a sunburst-finished silver tone with blue-transferred numbers. The caseback showcases the manually wound, four-barrel (in series) L.U.C 98.02-L movement layout that delivers a massive 9 days of power (part of the Chopard Quattro technology). This kind of high-power-reserve movement has become pretty normalized for Chopard and, because of that, I don't think it gets the appreciation it deserves. The movement, running at 4Hz, is also fantastically finished and features a Poinçon de Genève quality hallmark, plus COSC accuracy certification. As mentioned, the L.U.C. 1963 Heritage Regulator is limited to 25 pieces and is now available, retailing for $50,900. On the sportier end of things is the 42mm by 11.48mm 1963 Heritage Chronograph cased in Lucent Steel. It features a deep blue sunburst-polished, galvanic-treated dial, an eggshell-colored printed dial, and Rhodium-plated white gold hands for the hours, minutes, seconds, chronograph, and 30-minute and 12-hour counters. The wa...

Introducing: TAG Heuer Monza Flyback Chronograph Carbon Limited Edition Hodinkee
TAG Heuer Monza Flyback Chronograph Carbon Yesterday

Introducing: TAG Heuer Monza Flyback Chronograph Carbon Limited Edition

What We Know This weekend, Formula 1 returns to Ferrari's home track (for the series, at least) of Monza, and with that return, TAG Heuer is releasing a new version of the eponymous Monza Flyback Chronograph. The watch was originally released in 1976 to celebrate Ferrari's return to the top with the constructors' and drivers' Formula 1 championships, with its black-coated case setting the stage not only for the model's future but also for similar releases from Heuer (and later TAG Heuer). A Monza isn't a Monza unless it's black, so this new release fits the remit perfectly: a 42mm by 15.22mm case in forged carbon, with red accents on the dial. Often known as the Niki Lauda (after the driver who won the title in 1976), the original watch featured a lot of red (and was reissued over a decade ago), though the dial layout has changed significantly from the original. This time, that red has been swapped around, with accents on the minute-counting and chronograph hands, the combination pulsometer and tachymeter flange scale, and the flyback mark at 6 o'clock. The date is still included, moved to 9 o'clock (which in turn puts running seconds at 6 o'clock), but with an angled window. The indices are all printed, and the hands and hour markers use white Super-LumiNova. The watch is powered by the COSC-certified Caliber TH20-12 automatic movement, running at 4Hz. TAG Heuer didn't provide specifications here, but past versions of the Monza with this movement had an 80-hour power rese...

Citizen Garrison BM8560 vs TAG Heuer Autavia: An Affordable Pilot Watch Alternative? WatchRider
TAG Heuer Autavia Jul 24, 2026

Citizen Garrison BM8560 vs TAG Heuer Autavia: An Affordable Pilot Watch Alternative?

I own both the Citizen Garrison and the TAG Heuer Autavia WBE5116.EB0173, and the difference between them goes far beyond price. The Citizen Garrison uses Citizen’s light-powered Eco-Drive movement and a remarkably light Super Titanium case, while the TAG Heuer Autavia is a Swiss automatic pilot watch with a COSC-certified Calibre 5 movement, a 42 mm steel case and a distinctive blue smoked dial. One is accessible and practical, designed for easy daily ownership. The other is a discontinued premium model with strong aviation heritage. That makes this an unusual but revealing comparison. Can an affordable Citizen Garrison provide the same wrist presence, legibility and everyday enjoyment as a significantly more expensive TAG Heuer Autavia? And how much do the Autavia’s automatic movement, finishing, heritage and premium positioning actually change the ownership experience? In this comparison, I will examine their design, comfort, materials, movements, readability and real-world value. For anyone searching for the best affordable pilot watches, or wondering whether an affordable pilot watch alternative can compete with a premium Swiss model, these two watches offer a fascinating answer. Case Size, Quality, and Comfort Both watches are very well made, but I sincerely prefer the Citizen’s case. The TAG Heuer Autavia has the solid construction and clean finishing expected from a premium Swiss watch. Its stainless-steel case feels substantial, and the transitions between i...

The Titanium Treatment: Introducing The Doxa Sub 300 Ti5 Clive Cussler Fratello
Doxa Sub 300 Ti5 Clive Jul 15, 2026

The Titanium Treatment: Introducing The Doxa Sub 300 Ti5 Clive Cussler

Doxa is marking what would have been Clive Cussler’s 95th birthday with a new take on its most emblematic dive watch. The Doxa Sub 300 Ti5 Clive Cussler keeps the shape of the 1967 Sub 300 but features a case, crown, case back, and even the dial crafted from Grade 5 titanium. This COSC-certified chronometer […] Visit The Titanium Treatment: Introducing The Doxa Sub 300 Ti5 Clive Cussler to read the full article.

Industry News: Ronda Returns to Mechanical Movements with the Impressive R01 Worn & Wound
Seiko Jun 12, 2026

Industry News: Ronda Returns to Mechanical Movements with the Impressive R01

Typically, not a lot happens in the world of third-party mechanical watch movements. The ETA2824 reigned supreme for decades until Swatch Group stopped openly supplying them, giving way primarily to Sellita, Soprod, and La Joux Perret on the Swiss side, and Miyota and Seiko on the Japanese side. For the most part, the catalogs of those brands stayed relatively unchanged for many years, but now, it appears that there’s a bit of an arms race happening. The days of 42-hour power reserves are over, and brands are now vying for features and specifications once limited to more expensive calibers; to that end, there have been a series of interesting events/releases. First, the COSC announced the creation of the “Excellence Chronometer” standard with a -2/+4 accuracy standard among other considerations. Sellita launched the SW200-2 Power + movements with 65-hour reserves, new gear trains, and other improvements. The CEO of La Joux Perret spoke about the upcoming G-200 caliber, which will feature a 72-hour reserve and antimagnetic properties, on the Hodinkee podcast. And this week, a very exciting new automatic was announced by a surprising source: Ronda. The R150 launched in 2016 Ronda is a well-known Swiss manufacturer that was founded in 1946. Over their 80 years of existence, they have specialized in many things, from component manufacturing to ebauchés and full mechanical movements to, beginning in the 1970s, quartz calibers, which is what they are best known for today....

Introducing: Oris Celebrates Its Birthday With The 2026 Hölstein Edition Hodinkee
Oris Celebrates Jun 1, 2026

Introducing: Oris Celebrates Its Birthday With The 2026 Hölstein Edition

What We Know Every year on June 1, Oris celebrates the founding of its brand by releasing watches named after its hometown. This time, they're doing so with 250 numbered pieces based on the brand's new Artelier watch. The new version features small seconds, a 120-hour power reserve, the Caliber 401 movement, and an interesting retro-futuristic style. The new Oris Hölstein Edition 2026 has a stainless steel case measuring 39.5mm by 11.1mm, a 45.5mm lug-to-lug, and 30m water resistance. The dial is light grey with a subtle fumé effect from its shape, with a brighter subsidiary seconds dial in a mirror finish and a small red seconds hand. That silver, domed dial and claw-style hour markers make the watch feel a bit like a throwback to the late 1960s, but with modern specifications. The hour and minute hands have Super-LumiNova. As a bonus, the movement (while not COSC-certified) has an accuracy of 3/+5 seconds per day and is highly anti-magnetic. It's also automatic winding. The caseback uses a special laser treatment that engraves the Oris Bear, features the words "Hölstein Edition 2026," and produces a mirror-like, iridescent rainbow finish. To steal the description from one of the greatest haircuts known to man, it's business in the front and party in the back. The watch retails for CHF 3,800. What We Think Oris has been doing these limited editions, as far as I can tell, since 2020, and each one has been anything but traditional. Obviously, the Oris bear often plays a ...

Hands-On: A Triple Review Of The Jaeger-LeCoultre Master Control Chronomètre Collection Hodinkee
Jaeger-LeCoultre Master Control Chronomètre Collection May 27, 2026

Hands-On: A Triple Review Of The Jaeger-LeCoultre Master Control Chronomètre Collection

We're a few months removed from Watches & Wonders, which gives us some clarity about what was buzz, what was hype, what fell off the wish lists, and what will be a long-term winner. It's looking like Jaeger-LeCoultre had one of the best releases of the fair with the Master Control Chronomètre series. The Master Control line has largely been a dressy take on traditional design cues for a brand people usually think of first for its Reverso. But now, JLC has shown that Master Control can do more. More than just a new case and bracelet, all watches are in-house chronometer-certified 4Hz, 70-hour power reserve movements (COSC does the certification) with a new High Precision Guarantee (HPG) seal, which supplants the former 1000 Hours Control. That new HPG seal means that the brand trials cased watches on four daily-wear specific issues—shocks, positions, altitude, and temperature—over three days, while guaranteeing eight traditional techniques of quality aesthetic finishing. The watches I photographed were brand new and wrapped in plastic, so you have to look past a bit of that to see the quality, but it certainly is there in person. Now with three models in steel and rose gold, with five SKUs (one watch only comes in steel and not gold), measuring 38mm by 8.4mm or 39mm or 9.2mm with 50m of water resistance, the new line brings a lot to the table. Inspired by the brand's Master Mariner Chronomètre line, launched in 1973 as their offering for an integrated bracelet (or adj...

Hands On: Jaeger-LeCoultre Master Control Chronometre SJX Watches
Vacheron Constantin Overseas May 26, 2026

Hands On: Jaeger-LeCoultre Master Control Chronometre

The most talked-about release from Jaeger-LeCoultre (JLC) at Watches & Wonders was the refreshed Master Control collection, which debuted on a surprising integrated bracelet. Available with or without perpetual calendar or power reserve complications, the Master Control Chronometre is powered by the latest version of the brand’s long-running cal. 899, which is now certified by both COSC and a new internal standard called the High Performance Guarantee (HPG). Initial thoughts Since the Master Control Chronometre debuted at Watches & Wonders, I have been asked multiple times whether it is a dress watch or a sport watch. Setting aside the issue of the false dichotomy that exists between these categories, the Master Control Chronometre presents itself primarily as a dress watch on a bracelet. While the bracelet’s angular facets evoke those of the Vacheron Constantin Overseas, the staid Master Control dial is what defines the look. The simple sunray finish and slim hands — not to mention the lack of any lume — firmly root the Master Control Chronometre in the dress watch category. The soft blue and brown dials are each attractive in their own right, with colour-matched date wheels to avoid any harsh transitions. While the text is arguably superfluous, the ‘Chronometre’ label is more interesting than the typical ‘Automatique’ text that mars most Master Control dials. In terms of the value proposition, it’s a tale of two metals. The stainless steel model isn’t...

Introducing: Serica Downsizes Its Field Chronometer With The 35mm Ref. 7505 Hodinkee
Serica Downsizes May 21, 2026

Introducing: Serica Downsizes Its Field Chronometer With The 35mm Ref. 7505

What We Know It's time to put aside the debate of big watches versus small watches. I think we can at least agree that options are a good thing, so everyone can get what they want. With that in mind, Serica has released three new, smaller Field Chronometer watches measuring only 35mm by 9.6mm thick with a COSC-certified automatic movement and three new enamel dials. These three new watches, with stainless steel cases, play off the design language of the ref. 6190 with a few tweaks. There's the slightly larger, fixed bezel with pips at 3, 6, 9, and 12 o'clock. They have a double-domed anti-reflective sapphire that should somewhat magnify the smaller dial. The two-tone cream-and-black "Tuxedo" dial is similar to the ref. 6190 TXD, with hand-applied numerals. The other two, the "Minute Critical" dials in black or olive green, aren't that far from the ref. 6190 "Denali" that is already on offer in a larger size, with added 5-minute Arabic numerals. All three have Super-LumiNova C3 lume. Inside the case is the SoProd M100 movement, which is COSC-certified for accuracy, making it a Field Chronometer in both name and function. The caliber runs at 4Hz, is self-winding, and has a 42-hour power reserve. According to Serica, it also has a decorated plate with Côtes de Genève, and while there are no photos of the caseback, I would assume it is still a closed caseback like its big sibling.  Then there's the final major update: the watch comes with a redesigned Bonklip bracelet, fea...

The Next Chapter of the Breitling Chronomat Brings a Whopping 22 New Additions Worn & Wound
Breitling Chronomat Brings May 19, 2026

The Next Chapter of the Breitling Chronomat Brings a Whopping 22 New Additions

As the saying goes, variety is the spice of life, and with Breitling’s release of a staggering 22 new models to its Chronomat lineup, it just might be true. The model is pretty iconic, starting as a pilot’s watch for military forces and later becoming a cultural phenomenon, with one of its claims to fame being its appearance on Jerry’s wrist across Seinfeld. The latest chapter of the collection covers the Chronomat B01 42, Chronomat Automatic B31 40, and Chronomat Automatic 36, giving Breitling’s signature sport watch a full refresh across size, movement, and material options.  The Chronomat B01 42 remains the main chronograph in the revamp, with a few updates aimed at making the watch look (and feel) a little better on the wrist. For starters, the case thickness has been slimmed from 15.1mm to 13.77mm, the crown guard has been reduced, and Breitling has removed the 1/100 scale from the rehaut for a cleaner dial. All of these updates may seem a bit inconsequential, but when brought together, they add up to an overall sleeker profile that’s meant to “enhance its simplicity,” as noted by Breitling’s Head of Design, Pablo Widmer.  The B01 42 is powered by the COSC-certified Breitling Manufacture Caliber 01, which offers approximately 70 hours of power reserve. In stainless steel, it comes with the choice of a white, blue, or green dial, each with black chronograph counters. The range extends with several additional variations, including a two-tone steel and ...

Introducing: The Longines Legend Diver 59 Offers A More Rugged Look In A Larger Size Hodinkee
Longines Legend Diver 59 Offers May 18, 2026

Introducing: The Longines Legend Diver 59 Offers A More Rugged Look In A Larger Size

What We Know For collectors, the Longines Legend Diver seemingly hit a sweet spot in sizing during its 39mm refresh back in 2023. But, as with many things in life, you can't please 'em all with just one version. So today's new Legend Diver 59 offers a much larger interpretation of the brand's tribute to its 1959 design, in a 42mm model that will surely make a lot of larger wrists happy. It's not the brand's only 42mm Legend Diver, technically speaking, since some older models are still listed in the catalog. But it's the first larger size to have come out since that 2023 refresh. The 42mm case has a thickness of 12.85mm and a lug-to-lug measurement of 50.1mm. As customary with the Legend Divers, two crowns sit on the right side of the case, with the one at two o'clock for rotating the internal bezel and the one at four o'clock to wind and set the time. What this new Legend Diver 59 offers as a new design touch comes in the dial. Whereas the current generation Legend Divers sport glossy lacquer dials, this Legend Diver 59 has a matte black grained-texture dial and internal bezel for a more rugged look. Adding to that aesthetic are new sandblasted hands and indices, which are then paired with three-dimensional Super-LumiNova accents in an old radium color. The Legend Diver 59 is COSC-certified, thanks to the ETA-manufactured but exclusive-to-Longines automatic caliber L888.6. It's a distinctly modern caliber, featuring a silicon balance spring and a power reserve of 72 hours...

Introducing - The Parmigiani Fleurier Tonda PF Chronograph 40mm, Now in Rose Gold Monochrome
Parmigiani Fleurier Tonda PF Chronograph 40mm May 13, 2026

Introducing - The Parmigiani Fleurier Tonda PF Chronograph 40mm, Now in Rose Gold

Parmigiani Fleurier’s luxury sports watch collection, the Tonda PF, got off to a flying start with the release of not one but two chronographs in its inaugural 2021 lineup. Led by the refined Split Seconds in platinum and the high-frequency COSC-certified integrated manufacture movement powering the steel Tonda PF Chronograph, the collection may be understated […]