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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.

Why I Bought It: The Zenith Chronomaster Tribute to Charles Vermot - Reprise Quill & Pad
Zenith Chronomaster Tribute Jan 13, 2024

Why I Bought It: The Zenith Chronomaster Tribute to Charles Vermot - Reprise

Quentin R. Bufogle could go on and on about the Zenith Chronomaster Tribute to Charles Vermot’s stunningly beautiful, metallic blue dial, silicon escapement (visible via the open heart feature), COSC chronometer certification and that it’s one of the last truly great Chronomasters, but that would be missing the point, i.e. how Charles Vermot saved Zenith.

Omega ousts Rolex with brand new technology that promises 0/+2 second accuracy a day Time+Tide
Omega ousts Rolex Jan 26, 2023

Omega ousts Rolex with brand new technology that promises 0/+2 second accuracy a day

New Spirate™ System debuts new hairspring with ultra-fine 0/+2 regulation capability. The system debuts in new Speedmaster Super Racing watch. Its usage beyond the Super Racing is planned, but consumers will need to wait for new calibres – not just new watches. COSC, METAS, Superlative, and more. There are various chronometer certifications within the industry today, with each, … ContinuedThe post Omega ousts Rolex with brand new technology that promises 0/+2 second accuracy a day appeared first on Time+Tide Watches.

Earth just broke the record for the shortest recorded day in modern history. What does this mean? Time+Tide
Aug 9, 2022

Earth just broke the record for the shortest recorded day in modern history. What does this mean?

Watch lovers are obsessed with accurate timekeeping, and brands always look to standout with various certifications – whether COSC, METAS or Superlative Chronometer standards among others. Every time I set my watch, I always sync it – to the second – to my Watchville app clock, which effectively displays my iPhone’s highly synchronised time based … ContinuedThe post Earth just broke the record for the shortest recorded day in modern history. What does this mean? appeared first on Time+Tide Watches.

Swatch Introduces the Big Bold Jelly SJX Watches
Swatch Dec 27, 2019

Swatch Introduces the Big Bold Jelly

One of the iconic Swatch watches from its 1980s heyday was the Jelly Fish (ref. GZ010), which was unveiled in 1983, the same year Swatch itself was launched. A quartz movement entirely exposed in a clear plastic case – accented with brightly coloured hands – the Jelly Fish was a bestseller that encapsulated what Swatch was all about: no-frills but fun watchmaking. The Jelly Fish remained in production, in one form or another – there was even a COSC-certified chronometer limited edition (GK124) in 1990 – for over two decades. Now the spirit of the Jelly Fish returns as the Big Bold Jelly, essentially the same idea but in a larger watch case. The Big Bold Jelly features a quartz movement inside a Big Bold case, just like the recent limited editions created in collaboration with fashion label A Bathing Ape (BAPE). The case is a large 47mm in diameter, with the crown unusually positioned at two o’clock. But just as with the original Jelly Fish, the case is clear plastic, while the band is translucent silicone. And the hands are rendered in bright colours – red, yellow and blue – with a bit more colour provided by the gilded wheels within the movement. Key facts and price Big Bold Jelly Ref. SO27E100 Diameter: 47mm Height: 11.75mm Material: Clear plastic Water resistance: 30m Movement: Quartz Functions: Hours, minutes, and seconds Strap: Silicone with aluminium pin buckle Availability: At Swatch stores Price: US$110 For more information, visit Swatch.co...

Testing A Master: Omega And Swiss Federal Institute Of Metrology Announce New Certification Process Revolution
Omega Dec 11, 2014

Testing A Master: Omega And Swiss Federal Institute Of Metrology Announce New Certification Process

A Swiss watch is great, but a Swiss Chronometer is even better; for many customers there is added appeal in a COSC-certified watch. No surprise that some of the largest Manufactures in Switzerland, also have incorporated the Chronometer certification for the majority of their collections. Omega thought it was time to step up the certification […]

Introducing: The Three-Watch-Strong Lebois & Co Heritage Small Seconds Collection Fratello
Oct 30, 2025

Introducing: The Three-Watch-Strong Lebois & Co Heritage Small Seconds Collection

After a series of chronographs, the Dutch-based brand Lebois & Co returns with a trio of three-handers. Please welcome the Heritage Small Seconds collection. The silver Script, blue Baton, and black Numeral Founder’s Launch editions are COSC-certified chronometers with perks for early adopters. A “Chronomètre Lebois & Co” sweater inspired by Parisian streetwear is waiting […] Visit Introducing: The Three-Watch-Strong Lebois & Co Heritage Small Seconds Collection to read the full article.

Behind the DIN 8330 Standard for Pilot’s Watches Worn & Wound
Sinn lead Oct 3, 2025

Behind the DIN 8330 Standard for Pilot’s Watches

Standards and certifications in watchmaking were primarily developed for chronometry, as well as to reassure the buyer that their watch had been thoroughly tested to a certain level of accuracy. The standards we see most often in the technical specifications are COSC, METAS, and other company or regional chronometry certifications. In modern watchmaking, other key standards like the ISO 6425 dive watch standard, which was developed in the 1990s and followed by watch companies, also come into play. These standards were largely based on various military set standards for watches; however, since each military set their own requirements, there was not one universally followed standard. The International Organization for Standardization (ISO) published specific requirements and testing procedures for a watch to be officially designated a “Diver’s watch”. While there is no ISO standard for pilot’s watches, there are specific requirements set by militaries around the world. One of the most well-known standards is from the WWII German pilot’s watch known as the “Beobachtungsuhren” or “B-Uhren.” B-Uhren pilot’s watch standards are well documented and are still followed by many watch companies to this day. In March 2012, Sinn lead an initiative in collaboration with the Faculty of Aerospace Technology at the Aachen University of Applied Sciences to create TESTAF – Technical Standard for Pilot Watches. TESTAF was developed so that a pilot’s watch meets all mod...

How marine chronometers shaped horology today Time+Tide
Sep 5, 2023

How marine chronometers shaped horology today

Navigation is definitely taken for granted these days. Not that I don’t personally rely on Google Maps to take me pretty much everywhere, but the art of traversing the globe was one of the most difficult, frightening, and often heroic skills for thousands of years in human history. As if finding your way through icy … ContinuedThe post How marine chronometers shaped horology today appeared first on Time+Tide Watches.

The Observatory Chronometers that Timed the Tour de France SJX Watches
Longines split-seconds stop watches – Aug 12, 2019

The Observatory Chronometers that Timed the Tour de France

Watches once owned by prominent personalities are captivating. Paul Newman’s “Paul Newman” Daytona, the Rolex “Bao Dai”, Buzz Aldrin’s Speedmaster Moonwatch, the Henry Graves Supercomplication, and even J. Pierpont Morgan’s lost pocket watch, are amongst most sought after timepieces in the world. In fact, a good number of the most expensive watches ever sold at auction have notable provenance, which turns a mere watch into a historical artefact. Probably the most important timekeepers in cycling, these are a pair of Longines split-seconds stop watches – refs. 7411 and 8350 respectively – that were used by Jean Pitallier, the former president of the French Cycling Federation, to time the Tour de France in the fading glory days of mechanical sports timing, just before quartz stopwatches took over. In fact, the pair of stopwatches are not merely chronographs, but also observatory certified chronometers. Watchmaking once represented the cutting edge research of mechanical engineering. Observatory time trials at Neuchatel, Geneva or Kew were rigorous scientific affairs, with movements Peseux 260 and Zenith 135 competing to be the most accurate movement in the world. But such movements were three-hand, time-only. Aside from tourbillon movements, very few complicated calibres were submitted to timing contests. Mr Pitallier’s pair of Longines were both certified by the Neuchatel observatory. The swan song of competitive timekeeping In modern day watch collectin...

The Tudor Northflag Returns Sharper and Stronger SJX Watches
Tudor Northflag Returns Sharper Yesterday

The Tudor Northflag Returns Sharper and Stronger

A decade after it first debuted, Tudor has revived the Northflag. Originally a 1970s-inspired sports watch to showcase Tudor’s first-ever in-house movement, the Northflag has been upgraded inside and out. The rebooted Northflag gains a GMT function plus refinements all round, ranging from superior detailing on the case to lume blocks on the dial. And the movement is now a Master Chronometer, while the price stays true to Tudor’s value-oriented focus at just over US$5,500. Initial thoughts The original North Flag was a bit quirky with its power reserve indicator, and also probably ahead of its time; a Tudor with an in-house movement seemed like an odd concept back then. I liked it then, but the North Flag wasn’t a commercial success, so it is surprising that Tudor has revived the model. But the new Northflag is an immediately appealing watch, reflecting Tudor’s advancements in design, manufacturing, and branding. In fact, the Northflag is one of the most interesting watches in the current Tudor catalogue, alongside the equally recent Monarch. Although practically everything Tudor makes is well priced and an easy recommendation, almost all of Tudor’s best watches are variations of the Oyster case and Black Bay diver. The Northflag, on the other hand, is something else entirely. The angular, 1970s-style case is different, as is the dial. But all the elements are harmonious, and the design works. This is one of my strongest recommendations in the Tudor line-up today,...

Introducing: Article Prep Hodinkee
Jul 29, 2026

Introducing: Article Prep

What We Know TK What We Think Something someone said someone. TK The Basics Brand: Model: Reference Number: Diameter: Thickness: Case Material: Dial Color: Indexes: Lume: Water Resistance: Strap/Bracelet: The Movement Caliber: Functions: Diameter: Thickness: Power Reserve: Winding: Frequency: Jewels: Chronometer Certified: Additional Details: Pricing & Availability Price: Availability: Limited Edition: For more, click here.

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...

Serica Introduces the new Ref. 7505 Worn & Wound
Serica Introduces May 21, 2026

Serica Introduces the new Ref. 7505

One of my favorite things is when a brand releases a watch that feels like the watch they always should have made. I’m sure we can all point to examples of this – that feeling that a new watch really belongs in the brand’s catalog, and we’re kind of surprised it never existed in the first place. That’s sort of how I think about the latest release from Serica, the Ref. 7505 Field Chronometer. Doesn’t it seem like Serica always had a 35mm field watch in their collection?  More than any other watch the brand has released to date, this feels like a distillation of what the brand is really about. You’ll recall that they launched with a collection of military inspired field watches all the way back in 2019, which at the time felt like they were already going a little against the grain at just under 38mm in diameter. In the years since, they’ve iterated on this general idea, with an ongoing series of sporty selections rooted in a kind of imagined vintage world, never borrowing too much from any one classic reference, but pulling from a variety of sources to create something that is uniquely their own. Part of that has always meant keeping the watches fairly compact. Looking over the press materials for this watch and thinking about the direction the brand has gone in, I wonder if, if circumstances had been different, they may have started here, with a 35mm field watch, to begin with.  This is unquestionably the right time to introduce a watch like this, at a mom...

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 […]

First Look - The Two-Tone & Chocolate Girard-Perregaux Laureato Chronograph 42mm Monochrome
Girard-Perregaux Laureato Chronograph 42mm May 7, 2026

First Look - The Two-Tone & Chocolate Girard-Perregaux Laureato Chronograph 42mm

The Laureato is Girard-Perregaux’s answer to the integrated luxury sports watch. Born in 1975 as a chronometer-certified quartz sports watch, Girard-Perregaux revived the Laureato in 2016 as a limited edition to celebrate the brand’s 225th anniversary, and later as a collection in 2017. Produced three years after Gérald Genta’s landmark Royal Oak but a year […]