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What is the YEMA Skin Diver CMM.20?
YEMA describes the Skin Diver CMM.20 as a modern interpretation of its 1960s skin divers. It brings that vintage-inspired design direction together with the brand’s manufacture micro-rotor movement and a contemporary bracelet adjustment system.
Timekeepers Club reported on April 16, 2025, that the collection had been available for preorder from April 15, with delivery planned for the end of April 2025. That was the launch-era schedule, not a statement of present stock or delivery timing.
Case and dimensions
For the cited steel version, YEMA lists a 316L stainless-steel case measuring 39.5 mm across, 47 mm lug-to-lug and 11.5 mm thick, with 20 mm lugs. Its surfaces are brushed, with polished bevels, and the crown is unguarded.
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The listed dimensions offer a useful starting point for judging fit, but they do not establish how the watch will wear on a particular wrist.
Bezel, crystal and water resistance
YEMA specifies a bidirectional dive bezel with a sapphire insert and 0–60 graduation. The bezel uses a “push-to-unlock” locking mechanism. The watch has a 2.2 mm double-domed sapphire crystal with anti-reflective coating and a sapphire exhibition caseback.
Rank #2
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The stated water-resistance rating is 30 bar / 300 m / 990 ft, alongside a screw-down crown. Those are the manufacturer’s specifications, not independent verification of dive performance.
CMM.20 movement and stated performance
The watch is powered by YEMA’s Calibre Manufacture Morteau 20 (CMM.20), a self-winding micro-rotor movement. YEMA lists a frequency of 28,800 vibrations per hour, a 70-hour power reserve, and hours, minutes and seconds. Its stated daily rate is −3/+7 seconds per day; that figure is a manufacturer specification, not a measured result from an independent test.
Rank #3
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Steel bracelet and adjustment
The steel version is fitted with YEMA’s brushed Scales Slim bracelet and adaptive glide micro-adjustment. Timekeepers Club’s launch announcement described the clasp as adjustable on the fly without removing the watch or using tools, and said the mechanism was intended to accommodate wrist swelling with heat, activity or time of day. That is the publisher’s description of the clasp feature.
Warranty and purchase terms
YEMA says watches fitted with its manufacture mechanical movement carry a five-year international warranty. The cited US-market product listing also stated a 14-day return period. Return terms and other purchase conditions can differ by storefront or region, so check the terms attached to the specific listing before ordering.
Rank #4
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YEMA Skin Diver CMM.20 specifications
| Specification | YEMA’s stated detail |
|---|---|
| Case material | 316L stainless steel |
| Case diameter | 39.5 mm |
| Lug-to-lug | 47 mm |
| Thickness | 11.5 mm |
| Lug width | 20 mm |
| Movement | Calibre Manufacture Morteau 20 (CMM.20), self-winding micro-rotor |
| Frequency | 28,800 vibrations per hour |
| Power reserve | 70 hours |
| Stated daily rate | −3/+7 seconds per day |
| Water resistance | 30 bar / 300 m / 990 ft |
| Bezel | Bidirectional, sapphire insert, 0–60 graduation, push-to-unlock lock |
| Crystal | 2.2 mm double-domed sapphire with anti-reflective coating |
| Bracelet | Brushed Scales Slim steel bracelet with adaptive glide micro-adjustment |
| Warranty | Five-year international warranty for watches with YEMA manufacture mechanical movements |
Sources: YEMA’s product listing; Timekeepers Club’s April 16, 2025 launch announcement.
Quick Recap
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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.
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