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Results for Chronometer (COSC)

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Chronometer (COSC)

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

Serica Bolsters the 5303 COSC Antimagnetic Diving Chronometer from Within Worn & Wound
Serica Bolsters Apr 26, 2023

Serica Bolsters the 5303 COSC Antimagnetic Diving Chronometer from Within

Although Serica has only been around since 2019, it feels like the young watch brand has been around for ages. In my opinion, a lot of that has to do with the maturity in which they conduct themselves, both in brand presence and progression. With any Serica novelty, you can bet that their approach to any watch design is performed with metronomic consistency – typically with minimal branding, steady visual cues, and a general inspiration by way of vintage military timepieces. It seems that any change that’s going to be made within each reference will be incremental, but that doesn’t mean the impact can be monumental. Such is the case with the new and improved Serica 5303 COSC Antimagnetic Diver Chronometer. To understand the latest update to the Serica 5303, we must look within. Serica has opted to keep the movement within the Soprod family, but instead of using the previous Newton P092 automatic, the Serica 5303 COSC now draws its power from the Caliber M100. The Soprod Caliber M100 is buoyed by a glucydur balance, incabloc shock system, a 42 hour power reserve, and most importantly, a 3.2mm movement thickness. With approximately 1.4mm of extra room to play using the transitional movement inside of the 5303 COSC case, Serica has built in several antimagnetic pieces including a soft iron movement holder, soft iron dial and a soft iron inner caseback. As a result, the magnetic resistance for the Serica 5303 COSC diver has skyrocketed from the traditional Swiss standard...

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...

Rexhep Rexhepi Reveals the Chronomètre Antimagnétique for Only Watch 2023 SJX Watches
F.P. Journe whose Chronomètre Furtif Bleu Aug 28, 2023

Rexhep Rexhepi Reveals the Chronomètre Antimagnétique for Only Watch 2023

Having dropped tantalising clues about his creation for Only Watch 2023 a few weeks ago, Akrivia founder Rexhep Rexhepi has finally taken the covers off the Rexhep Rexhepi Chronomètre Antimagnétique. A unique creation with a brand-new movement, the Chronomètre Antimagnétique (RRCA) is a time-only wristwatch with a steel case, one that was inspired by the magnetism-resistant chronometers of the mid-20th century. Its design has clear roots in vintage watches, while the movement features an indirect centre seconds with a hacking, zero-reset mechanism. Initial thoughts About the half the offerings in Only Watch 2023 are from independent watchmakers, but the creations vary tremendously in their originality and effort. Amongst the independents that created genuinely new watches for the event is F.P. Journe, whose Chronomètre Furtif Bleu is the first of a new sports model and likely the only watch ever made by an independent that boasts a tantalum bracelet. At the low-effort end of the spectrum is Moritz Grossmann that added “Only Watch” to the seconds register of a regular-production model and called it a day. The RRCA sits alongside the Chronomètre Furtif Bleu as being impressively original. The RRCA has an newly-designed steel case with a removable outer back and within, a calibre that inherits the distinctive Rexhep Rexhepi aesthetic but is newly developed from the ground up. Even though it is a simple watch with just three hands, the movement is executed in the Mr ...

First Look - The Colourful New Mido Multifort Chronometer1 Racer Monochrome
Mido Multifort Chronometer1 Racer One Oct 27, 2025

First Look - The Colourful New Mido Multifort Chronometer1 Racer

One of Swatch Group’s mid-level brands, Mido is beginning to get the attention it deserves with well-designed, robust watches that won’t break the bank. The recent revival of Mido’s 1970s TV-shaped watch, rechristened the Multifort TV Big Date, is a testament to the brand’s knack for transforming vintage designs into coveted models with contemporary specs. […]

Elegance Meets Accuracy - Going Forward, All Of Serica’s Watches Will Be COSC-Certified Chronometers Fratello
Serica s Watches Will Be Feb 1, 2024

Elegance Meets Accuracy - Going Forward, All Of Serica’s Watches Will Be COSC-Certified Chronometers

Any young watch brand constantly has to make choices about designs, costs, quality, and many other aspects that affect the organization every day. In the case of Serica, a young Parisian brand founded in 2019, elegance, reliability, and accuracy steer the decision-making process. In terms of elegance, I don’t think there was anyone who thought […] Visit Elegance Meets Accuracy - Going Forward, All Of Serica’s Watches Will Be COSC-Certified Chronometers to read the full article.

Does Mido deliver the best value COSC-certified Swiss in-house chronometers available in 2021? Time+Tide
Mido deliver Jun 30, 2021

Does Mido deliver the best value COSC-certified Swiss in-house chronometers available in 2021?

Is this headline a valid question, a bold claim, or simply the stone-cold truth? My knowledge of the Mido brand has recently been re-ignited. The Swiss brand has been in the game for more than 100 years, but my awareness previously centred on their vintage reissues. I see Mido’s DNA represented in the delightful ’60s … ContinuedThe post Does Mido deliver the best value COSC-certified Swiss in-house chronometers available in 2021? appeared first on Time+Tide Watches.

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...

COSC Upgrades Standards to Certify More Than Timekeeping SJX Watches
Rolex Feb 13, 2026

COSC Upgrades Standards to Certify More Than Timekeeping

Interesting news just out of Contrôle Officiel Suisse des Chronomètres (COSC), the venerable Swiss chronometer testing body, which has just announced a major revamp to its testing to honour the COSC’s standard’s 50th anniversary. Excellence Chronometer, COSC’s new and improved certification program, goes beyond the ISO 3159 norm that has defined its tests for decades. Instead of just testing movements, Excellence Chronometer will require completed, cased watches to run within -2/+4 seconds a day, as well as pass wear simulation and magnetism tests. Initial thoughts While COSC remains the primary chronometer testing body in Switzerland, thanks largely to Rolex, its protocols have been due for an update for some time now. With the rise of alternative and in-house precision testing programs, the standard chronometer certification can sometimes feel left behind. Rolex’s own Superlative Chronometer certification first requires a COSC certificate, but then makes sure the watches run at -2/+2 seconds per day after further in-house testing. The METAS Chronometer program also requires the standard COSC certificate, but guarantees a regulation of 0/+5 seconds per day and a great resistance to magnetic fields. Seeing that COSC slowly updates and imposes more stringent criteria is a good sign, but it may still not be good enough. With the rise of advanced internal certification programs, it looks like some brands submit their models to COSC testing just to make sure they can...

Introducing - The Brellum Pandial Power Reserve Black Titanium Chronometer LE Monochrome
Nov 28, 2025

Introducing - The Brellum Pandial Power Reserve Black Titanium Chronometer LE

Independent and proudly small-scale, Brellum thrives carving its niche in modern Swiss watchmaking. Founded by fourth-generation watchmaker Sébastien Muller, the brand produces only 299 pieces per year, each officially COSC-certified, meticulously decorated, and sold directly to end consumers. Following the recent release of the Pandial Power Reserve Chronometer LE in steel, Brellum now offers a […]

Longines’ Ultra-Chron Classic is a Double-Certified, High-Beat Chronometer SJX Watches
Jaeger-LeCoultre Geophysic E168 or IWC Oct 13, 2025

Longines’ Ultra-Chron Classic is a Double-Certified, High-Beat Chronometer

Longines continues to mine its archive to good effect with the Ultra-Chron Classic, a faithful reissue of the brand’s pioneering high-frequency wristwatch first launched in 1967. The Ultra-Chron Classic is more than just a remake of a vintage watch. While it has a clean, period-correct vintage aesthetic, the mechanics are entirely modern, namely a high-beat, 5 Hz automatic movement that is both COSC chronometer and TIMELAB certified. Initial thoughts Longines does well at bringing back beloved designs from the past, but built to modern standards. The Ultra-Chron Classic is the latest in a long line of historical reissues that began nearly two decades ago with the bestselling Legend Diver. The Ultra-Chron Classic is impressively faithful to the original in style, but because of that, not especially exciting in terms of design, retaining the all-business look that was common among high-performance gentlemen’s wristwatches of the era; the same criticism could be leveled at the Jaeger-LeCoultre Geophysic E168 or IWC Ingenieur ref. 666. In other words, the dial, hands, and indices are mostly true to the source material, but this pared-back look may have a harder time standing out in today’s market than it once did. Dressy? Classic? Or plain? Looks aside, the Ultra-Chron Classic is modern Longines at its best: a solid build, a brand-exclusive movement, proper sizing, and sensible pricing. The movement in particular stands out for being notable high-spec with its 36,000 bea...

Interview - Andreas Wyss, CEO of the COSC, on the Need to Adapt and a “Super-COSC” Certification to Come Monochrome
May 28, 2025

Interview - Andreas Wyss, CEO of the COSC, on the Need to Adapt and a “Super-COSC” Certification to Come

If you own mechanical Swiss watches, one of them potentially came to you with a COSC chronometer certificate. But not everyone knows exactly what this certificate means. The COSC is the Contrôle Officiel Suisse des Chronomètres or the Official Swiss Chronometer Testing Institute. COSC certifies Swiss-made movements or watches as chronometers (not to be confused […]

A Heavenly “Match” - The Olympique De Marseille × Jacques Bianchi Marseille JB200 Chronometer Limited Edition Fratello
Aug 20, 2026

A Heavenly “Match” - The Olympique De Marseille × Jacques Bianchi Marseille JB200 Chronometer Limited Edition

“Droit au But,” translated roughly as “Straight to the Goal,” has been Olympique de Marseille’s motto since the club’s foundation in 1899 and appears beneath the “OM” crest. OM is one of the most recognizable clubs in French football. Its greatest achievement came on May 26th, 1993, when OM defeated AC Milan 1–0 in Munich […] Visit A Heavenly “Match” — The Olympique De Marseille × Jacques Bianchi Marseille JB200 Chronometer Limited Edition to read the full article.

Formex Enters The Arena Of Integrated-Bracelet Watches With Its Aria Manufacture Chronometer Fratello
Formex Enters May 29, 2026

Formex Enters The Arena Of Integrated-Bracelet Watches With Its Aria Manufacture Chronometer

As a small brand, Formex has consistently pushed the boundaries of affordable watchmaking. By using new materials, integrating innovations, and simply creating a great, varied collection of watches, the young Swiss brand has stood out in recent years. With the new Aria Manufacture Chronometer, Formex unveils a new milestone for the company. It marks a […] Visit Formex Enters The Arena Of Integrated-Bracelet Watches With Its Aria Manufacture Chronometer to read the full article.

Tudor Introduces A Slimmer Black Bay 58 With Master Chronometer Certification And Another Bracelet For The Black Bay 58 GMT Fratello
Tudor Introduces Apr 14, 2026

Tudor Introduces A Slimmer Black Bay 58 With Master Chronometer Certification And Another Bracelet For The Black Bay 58 GMT

Tudor expands its lineup of mid-size dive watches with an updated Black Bay 58 and a new bracelet option for the Black Bay 58 GMT. Both watches keep the familiar 39mm case and continue to draw on late-1950s Tudor dive-watch aesthetics. The three-hand model adds technical upgrades, revised case proportions, and Master Chronometer certification. These […] Visit Tudor Introduces A Slimmer Black Bay 58 With Master Chronometer Certification And Another Bracelet For The Black Bay 58 GMT to read the full article.

Fratello Talks: How Much Does Chronometer Certification Matter? Fratello
Apr 9, 2026

Fratello Talks: How Much Does Chronometer Certification Matter?

“Chronometer” is one term that frequently comes up in watchmaking. We see it stamped on dials, highlighted in marketing materials, and often used as a synonym for “high quality.” But how much does chronometer certification actually matter to us as collectors? In this episode of Fratello Talks, Nacho is joined by Daan and RJ to […] Visit Fratello Talks: How Much Does Chronometer Certification Matter? to read the full article.

Serica Introduces the 5330 Dive Chronometer Worn & Wound
Serica Introduces Mar 13, 2026

Serica Introduces the 5330 Dive Chronometer

One of watchmaking’s simplest but most iconic complications, the date window, is the source of much admiration, and yes, a little bit of ire. One of the biggest points of contention on any inclusion of a date window is the balancing of it on the dial; after all, how do you place it to not ruin the symmetry (or asymmetry) of a carefully-crafted design? With their new Ref. 5330 Dive Chronometer, Serica has chosen a sleek solution for their first date window inclusion: nestle it at 3 o’clock, taking the place of the marker, and give it a crisp red accent to stand out. Sure, it’s not necessarily revolutionary, but it adds a sophisticated touch to an already clean dial. The core tenets of the 5330’s design carry over from other models in Serica’s Dive Chronometer lineup, with circular hour markers and a double graduation bezel being the most recognizable, and a 39mm 316L stainless steel case housing an identical SoProd M100 Swiss automatic movement. The matte black dial and anthracite-grey outer bezel ring contrast with the steel of the inner bezel and case, and the cream Super-LumiNova on the hands and hour markers. Similarly, the cream date window and red numeral add both a sense of cohesion and a highly legible flash of color to give the dial an extra layer of aesthetic complication. It’s certainly a welcome addition visually, and keeps the design from feeling too austere.  At 12.2mm in thickness and 46.5mm lug-to-lug, the 5330 is sized well for most wrists, and...

Serica Introduces The 5330 Dive Chronometer - The Brand’s First Watch To Feature A Date Window Fratello
Serica Introduces Mar 12, 2026

Serica Introduces The 5330 Dive Chronometer - The Brand’s First Watch To Feature A Date Window

The guys at Serica take their vintage-inspired designs very seriously. The brand’s watches are all about the perfect proportions, high legibility, and great wearability. Up until now, a date window wasn’t part of that equation. However, as representatives of many brands tell us, some people won’t buy a watch unless it has a date window. […] Visit Serica Introduces The 5330 Dive Chronometer - The Brand’s First Watch To Feature A Date Window to read the full article.

Chronometer Watches Matter - Why The World Of Luxury Needs Accuracy Fratello
Feb 25, 2026

Chronometer Watches Matter - Why The World Of Luxury Needs Accuracy

Having the exact time on hand is nothing special nowadays. Almost always, you’re connected to satellite time (GPS), which is based on atomic clocks in satellites that measure time to 100 billionths of a second. Optimizing accuracy through mechanical parts is a whole other matter and an age-old quest. A chronometer - the word derives […] Visit Chronometer Watches Matter - Why The World Of Luxury Needs Accuracy to read the full article.

Hands-On: The Brellum Duobox 39 Ice Blue Mother Of Pearl Chronometer Fratello
Feb 16, 2026

Hands-On: The Brellum Duobox 39 Ice Blue Mother Of Pearl Chronometer

We continue to be impressed by the watches from Brellum. The small brand produces a maximum of 299 pieces per year, which comprises several limited-edition releases. Today, we go hands-on with the latest model, the Duobox 39 Ice Blue Mother of Pearl Chronometer. Yes, that’s a lot of words, but the important details worth noting […] Visit Hands-On: The Brellum Duobox 39 Ice Blue Mother Of Pearl Chronometer to read the full article.