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Chronometer (COSC)

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

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The New Tudor Black Bay METAS Makes A Monochromatic Debut Fratello
Tudor Black Bay METAS Makes Apr 9, 2024

The New Tudor Black Bay METAS Makes A Monochromatic Debut

As Watches And Wonders 2024 kicks off, Tudor introduces the latest incarnation of the upgraded Black Bay model. Following in the METAS-certified footsteps of last year’s introduction, in 2024, the red and gold accents are stripped away in favor of a monochromatic look. And it turns out that when you take away the signature livery […] Visit The New Tudor Black Bay METAS Makes A Monochromatic Debut to read the full article.

Hands-on – The Tudor Black Bay 58 Burgundy, now with METAS Movement and More Updates Monochrome
Tudor Black Bay 58 Burgundy Apr 10, 2025

Hands-on – The Tudor Black Bay 58 Burgundy, now with METAS Movement and More Updates

Of all the new releases from Tudor at this year’s Watches and Wonders, the standout piece was undoubtedly the evolution of the Black Bay 58 line, now presented in a striking all-burgundy design, with both the dial and bezel dressed in the deep red tone. While the dial colour holds historical significance, the real game-changer […]

Tudor’s Classic Black Bay 58 Gets an Update SJX Watches
Tudor s Classic Black Bay Apr 17, 2026

Tudor’s Classic Black Bay 58 Gets an Update

Tudor’s bestseller just got a new update. The new Black Bay 58 builds upon last year’s burgundy version, coming in the beloved black dial with gilt accents configuration. Not only did the iconic vintage-inspired diver get slimmer and better proportioned, but it also come with a choice of three different straps. Initial thoughts Ever since Tudor was rejuvenated the brand became almost synonymous with the well-built and equally well-styled Black Bay collection. The model line grew to include various complications, from GMT functions to chronographs all while retaining the core vintage-coded aesthetic.  This streamlined “BB58” format was first introduced in 2024 with the Black Bay 58 GMT. The watch featured sleeker case proportions, a METAS-certified movement and a slimmer, more practical crown.  A burgundy version of the time-only Black Bay then followed and now Tudor adapts arguably their most iconic configuration to this updated format.  Due to its proportions, overall construction and colour scheme the watch strongly resembles the vintage Rolex Ref. 6538. The watch was famously worn by Sean Connery’s James Bond in the first ever Bond movie, Dr. No. Tudor’s new case proportions work so well with the vintage-inspired black and gilt dial that the new reference is guaranteed to be a big hit with Bond fans.  Notably, the new Black Bay 58 comes with a choice of two steel bracelets and a rubber strap. Apart from the Oyster-inspired faux-rivet three-link bracelet ...

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...

The COSC Introduces the New Excellence Chronometer Certification Worn & Wound
Tudor as well as other Feb 12, 2026

The COSC Introduces the New Excellence Chronometer Certification

The Contrôle Officiel Suisse des Chronomètres (COSC, the body responsible for certifying watch movements as Swiss chronometers) has just announced a new chronometry standard that will be rolled out over the course of 2026. The news comes at a time when the COSC has some competition for timekeeping certifications, most notably the METAS certification (which first requires a watch movement to be COSC certified) used by Omega and Tudor, as well as other certifications provided by the brands themselves.  The new COSC certification is being framed as an additional level of certification that will accompany the familiar “Certified Chronometer” tag that is seen on the dials and paperwork of millions (literally) of watches that have been put through the COSC paces over the years. The new “Excellence Chronomenter” certification provides an additional layer of guarantee of reliability that goes beyond simple accuracy. As a refresher, COSC certification certifies the movement is working at an optimal level, not a fully cased watch. To achieve a Certified Chronometer certification, a movement must show average accuracy of -4 to +6 seconds per day over a 15 day period, tested across 5 positions and 3 temperatures.  The Excellence Chronometer certification tightens the accuracy threshold from a spread of 10 seconds in total to 6 (-2 to +4 seconds per day). It also adds metrics for magnetic resistance and power reserve verification in fully cased watches. According to the COS...

Slimmer, Sharper Seamaster: Omega Updates the Planet Ocean SJX Watches
Omega Updates Nov 26, 2025

Slimmer, Sharper Seamaster: Omega Updates the Planet Ocean

Omega marks the 20th anniversary of the Seamaster Planet Ocean with a full redesign, introducing a sharper, faceted case and a slimmer profile that addresses long-standing concerns about about the model’s thickness. The fourth generation design retains the headline 600 m water resistance and METAS-certified movement, but adopts a more contemporary silhouette that differentiates it from earlier generations. The anniversary launch spans three colourways - black, blue, and the signature orange - with the latter now priced in line with the Rolex Submariner. While the refresh enhances everyday wearability, it also moves the Planet Ocean slightly away from the recognisable aesthetic that has defined the collection since its 2005 debut. Initial thoughts The Seamaster Planet Ocean is a watch that carries a lot of nostalgia for me personally. The first generation model, launched in 2005, was the first mechanical watch I purchased for myself in my student days and while my watch, powered by the slim cal. 2500C, has seen the inside of the Omega service centre more times than I would have liked, it still has a place in my regular rotation, especially when the weather turns warm. The appeal of the Planet Ocean is its fresh interpretation of historical Omega motifs; it features details like the broad arrow hands without attempting to be a vintage remake. The collection was refreshed in 2011 and again in 2016, but it seemed to get chunkier with each new iteration, to the dismay of ...

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...

[VIDEO] Hands-On: the Tudor Pelagos Ultra Worn & Wound
Tudor Pelagos Ultra Every year May 22, 2025

[VIDEO] Hands-On: the Tudor Pelagos Ultra

Every year, the watch industry plays the popular game “my favorite release from Watches and Wonders”. We try to pick unique watches, offer a unique perspective on them, and potentially shine a light on a model that we think deserves the title. However, I genuinely believe that if you told every one of those journalists that they had to purchase a watch announced at the show, roughly half would choose a different piece. They would most likely select something that suits their style better, fits into their collection, or maybe doesn’t shine as the most impressive piece but is still the one they want to take home. I am guilty of this. For two years in a row now, my “forced to purchase” choice has been a Tudor watch. Last year, the Black Bay ‘Monochrome’ made my purchasing shortlist further cemented after I had the chance to go hands-on with it for an extended period. The new black on black color scheme looked great, the METAS-certified caliber is impressive, and that five-link bracelet just wears incredibly well. But while last year’s Black Bay “Monochrome” was simply a new color extension, the Pelagos Ultra redefines the collection while setting a few benchmarks along the way. Touted as Tudor’s most technologically advanced watch yet, it somehow stuffs the stat sheet while remaining wearable. The lightweight case crafted from grade 2 titanium with a grade 5 caseback wears better than the 43mm diameter might lead on. At 14.5mm thick with a lug-to-lug of ...

Omega Introduces the Concise Seamaster Diver 300M “No-Date” SJX Watches
Omega Introduces Nov 29, 2024

Omega Introduces the Concise Seamaster Diver 300M “No-Date”

Teased at earlier this year during the Summer Olympics when it was photographed on Daniel Craig’s wrist, the Omega Seamaster Diver 300M without a date has finally been officially unveiled. Making its debut in monochromatic colours, the no-frills Seamaster is essentially another take on the Seamaster 300M 007 Edition of 2019. The Seamaster “no-date” is available with either a black-aluminium dial laser engraved with the model’s customary wave-like pattern, or a vertically brushed steel dial with a silvery PVD coating. Less obvious but more notable for enthusiasts is the domed sapphire crystal that lends a vintage feel. Since Omega announced it will no longer be releasing limited edition watches, the new duo will be part of the permanent collection. Initial thoughts The date window has always been a hotly debated topic within watch enthusiast circles, which tend to prefer the purity of a date-less dial. No matter where a date window is placed, there will be critics. In my view, such criticism is sometimes valid. The Seamaster 300M certainly benefits from the facelift, which results in a more aesthetically pleasing dial. The clean dial also suits the functional nature of the model. Priced at US$6,500 on the mesh bracelet, the new Seamaster is priced right considering the feature, including the in-house cal. 8806, a METAS-certified Master Chronometer movement. Ironically, the new Seamaster is US$600 more expensive than the variant with a date. That said, it is arguably...

Introducing: The New Tudor Pelagos FXD GMT “Zulu Time” Fratello
Tudor Pelagos FXD GMT “Zulu Oct 30, 2024

Introducing: The New Tudor Pelagos FXD GMT “Zulu Time”

The Tudor Pelagos FXD GMT “Zulu Time” has just become the latest addition to the brand’s collection. This titanium GMT watch uses the Pelagos FXD as a base, adding a 24-hour bezel, 24-hour hand, and a new METAS-certified movement. The result is the brand’s most accurate and adventure-ready watch to date. Speaking of dates, this […] Visit Introducing: The New Tudor Pelagos FXD GMT “Zulu Time” to read the full article.

Recapping the Tudor x Worn & Wound Windup Watch Fair NYC Kick-off Event Worn & Wound
Tudor x Worn & Wound Oct 25, 2024

Recapping the Tudor x Worn & Wound Windup Watch Fair NYC Kick-off Event

Just dip into the Worn & Wound YouTube channel search for Tudor. Whether it’s ongoing interest in our hands-on videos with their watches or the popularity of our Thunderdome series, it’s clear that Tudor is an extremely important brand to our enthusiast audience. So when they offered their Tudor Boutique within the Tourneau space in the Meatpacking District of Manhattan as a venue for the kick off event of the Windup Watch Fair NYC weekend, we were both honored and excited. The Thursday before any Windup weekend is filled with anticipation that you can genuinely feel. Fairgoers seem to be gearing up for either battle, a concert by their favorite band, or a little of both. The Tudor Boutique was a perfect place to both harness that energy and build on it for the rest of the long weekend. Their boutique is designed to be a part showroom and part gathering space for the Tudor-curious. Last Thursday night, it was filled to capacity with fans of both the Worn & Wound and Tudor brands. This was most evident in the sheer amount of interesting and unique Tudor watches on the wrists of multiple attendees! Attendees were greeted with a signature cocktail called the “METAS Manhattan,” referring of course to the Master Chronometer certification. A comprehensive standard that covers the main functional characteristics of a watch including: precision, resistance to magnetic fields, waterproofness and power reserve. Watches like Tudor’s Black Bay Ceramic, the Black Bay, and the...