Partly—if “late” means COSC is only now adding tests of the finished watch; less clearly if it means the new program is redundant or already behind a directly equivalent rival. COSC’s Excellence Chronometer Certified level keeps its established movement-testing stage and adds evaluation after the movement is cased. The schedule announced by the Federation of the Swiss Watch Industry (FH) points to brands entering the process from October 2026, with the first watches expected to reach the market from then. That is a response to a real gap, but the available protocols do not support a simple race-to-the-best verdict.
What COSC Excellence is meant to certify
Excellence Chronometer Certified is an additional level, not a replacement for ordinary COSC Certified Chronometer certification. FH described it as a “complementary extension” of the existing standard in its March 12, 2026 announcement.
The key change is the test object. Conventional movement certification assesses the movement before it is returned to the manufacturer for casing. Excellence retains that stage and adds evaluation of the complete watch after casing. COSC says each watch will be tested individually rather than approved through sampling.
How the announced testing sequence works
- Movement testing: The movement undergoes 15 days of tests against the seven criteria of ISO 3159. After certification, it is returned to the manufacturer for casing.
- Complete-watch evaluation: The cased watch receives five additional days of evaluation. Within this stage, a robot simulates 24 hours of average real-life wear in semi-dynamic conditions. COSC also specifies a rate-deviation range of −2 to +4 seconds per day, continued performance under a 200 Gauss magnetic field, and verification of the power reserve against the figure stated by the watchmaker.
These are distinct stages: the 20 days are not all a wrist-wear simulation. The announcement gives the overall duration and identifies the 24-hour simulation, but does not publish the full protocol, the sequence and duration of every additional test, or detailed measurement conditions for each result.
Recommended Free Tools
#1 Best Overall
- Swiss Made Watch
- Movement: Automatic Mido Caliber - Power reserve 80 hours - COSC Certified
- Case Size: 40mm - Band Width: 21mm - Case Thickness: 11.3mm
- Case Type: Stainless steel - See-through case back - Crystal: Sapphire crystal
- Strap: Stainless steel bracelet - Folding clasp with push-buttons
Why the “late” criticism has merit
COSC’s own case for the change points to factors that affect a watch in use: exposure to magnetic fields, longer power reserves, new materials and more intensive use. Those are the organization’s stated reasons, not a quantified finding about how much any of those factors have changed. Still, the underlying distinction is important: a movement that passes tests on its own is not the same testing object as a cased watch with its finished components and real-world interactions.
Adding a complete-watch stage acknowledges that gap. From a buyer’s perspective, it is reasonable to ask why a prominent chronometer certifier did not make that distinction sooner, especially when the stated rationale concerns how mechanical watches are worn and used.
Rank #2
- Movement: COSC-Certified Automatic Mido Caliber 80 Chronometer SI with silicon balance spring. In addition to its non-magnetic properties, it offers greater precision and improved shock resistance. This caliber ensures exceptional autonomy of up to 80 hours.
- This Swiss-made MIDO timepiece, designed to withstand the extreme pressures of the deep sea, is exceptionally water-resistant to 60 bar (600 m/1968 ft). Equipped with a helium valve, it guarantees safe decompression during extended dives.
- Case Type: Stainless steel with ceramic bezel and Sapphire crystal with double sided anti-reflection treatment - Screw-down crown.
- Case Size: 43.5mm - Band Width: 22mm (Tapered) - Case Thickness: 14.55mm
- Strap: Tapered Stainless steel bracelet - Folding clasp with diving extension
Why the announcement does not settle the argument
The new level is an expansion of COSC’s existing process, rather than a claim that the old movement certificate is being withdrawn. Keeping the ISO 3159 movement stage while adding post-casing checks is an incremental change. It may also answer a different combination of questions from other watchmaker or standards programs.
For context, Rolex’s 2026 description of its Superlative Chronometer certification says the program includes resistance to magnetism, reliability and durability criteria during design and manufacturing, alongside finished-watch tests for precision, water resistance, self-winding and power reserve. This shows that a major watchmaker describes a broader set of performance criteria and checks on finished watches. It does not show that Rolex and COSC use equivalent protocols, have the same governance, or can be ranked criterion by criterion.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- Movement: Automatic Mido Caliber - Power reserve 80 hours - COSC Certified
- Case Type: Stainless steel and ceramic bezel - Screw-down crown
- Case Size: 43.5mm - Band Width: 22mm - Case Thickness: 14.55mm
- Crystal: Sapphire crystal with double sided anti-reflection treatment
- Strap: Stainless steel bracelet - Folding clasp with diving extension
Certification names alone are not enough for a fair comparison. A useful comparison asks:
- What is tested? A movement, a cased watch, or both?
- What rate result is required? What is the tolerance, and under what test duration and conditions does it apply?
- How is magnetism addressed? Is there a field test, what is its strength, and what performance is required afterward?
- Is power reserve checked? Is the stated reserve verified, and under what conditions?
- How broad is the coverage? Is every watch tested or only a sample?
- Who governs the process, and what can a buyer see? Consider who sets and administers the protocol, whether individual results are disclosed, and whether the buyer can access data for a specific watch.
The cited descriptions do not provide enough comparable detail to rank COSC, Rolex, METAS or other programs comprehensively. They establish useful points of contrast, not a common scorecard.
Rank #4
- COSC Certified Chronometer
- Case Size: 39.00 mm, Band Width: 20 mm, Case Thickness: 10.98 mm
- Automatic movement, 316L solid stainless steel bracelet, Roman dial type, Date
- Water-resistant up to a pressure of 10 bar (100 m / 330 ft): suitable for short periods of recreational swimming and showering, but no diving or snorkeling.
When Excellence-certified watches are expected
FH said COSC began integrating technology and upgrading equipment at the start of 2026, conducted pilot tests in March, and unveiled the program globally at Watches and Wonders in April. Its announced schedule says brands can fully enter the process from October 2026 and that the first watches are expected to begin arriving on the market from that month.
That schedule is a forecast, not confirmation that a named brand or model had completed certification. The announcement identifies no participating brand or specific Excellence-certified watch. Treat any product listing using the label as a claim to verify against a current COSC or brand source.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Best Value
- COSC Certified Chronometer
- Case Size: 39.00 mm, Band Width: 20 mm, Case Thickness: 10.98 mm
- Automatic movement, 316L solid stainless steel bracelet, Roman dial type, Date
- Water-resistant up to a pressure of 10 bar (100 m / 330 ft): suitable for short periods of recreational swimming and showering, but no diving or snorkeling.
What buyers can verify about COSC certification
COSC’s General Terms and Conditions, edition 7, were validated on February 7, 2025 and took effect that day. They say COSC certification is open to Swiss timepieces as defined by the referenced Swiss-watch ordinance, and list wristwatches with balance-spring oscillators among eligible categories. Those terms describe the general framework; they do not set out a separate eligibility rule for the announced Excellence tier.
The same terms describe official certificates and say a detailed individual certificate is optional. A purchaser may request test results from the brand, which the terms identify as the sole owner of that information. The terms do not establish what documentation or individual data buyers will receive for Excellence watches.
FH reported in April 2025 that COSC united over 60 brands. That is a dated industry figure, not a verified 2026 count. The same FH article said COSC and partner brands planned consumer certification cards giving buyers access to precise data on a watch’s tested movement; it described a plan, not confirmation that the cards were subsequently rolled out.
Verdict: late in addressing a real gap, not proven late by a simple comparison
The strongest case for “late” is that COSC’s new stage responds to performance questions that arise after casing, while its own rationale emphasizes modern use and magnetic exposure. The strongest counterpoint is that Excellence is an added layer to an established movement standard, and the public descriptions do not show that it duplicates another program or can be judged against one on identical terms.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
So the fairest answer is: COSC is late to adding complete-watch evaluation to this certification, but the announcement alone cannot establish that the resulting program is inferior, equivalent to another label, or already validated in buyers’ daily use. Its practical significance will depend on the finished protocol, participating watches and the information consumers can access.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
