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The YEMA Skin Diver Slim Bronze CMM.20 is a compact-profile mechanical dive watch with a 39 mm bronze case, 10 mm stated thickness and YEMA’s CMM.20 micro-rotor automatic movement. YEMA listed reference 12.26.20.34.ZN.U4 at $2,490 when reviewed; price and availability can change. Its appeal is the combination of small-case dimensions, bronze, and a manufacture movement—not a performance claim independently verified here.
What is the YEMA Skin Diver Slim Bronze CMM.20?
It is a bronze-cased skin diver built around YEMA’s Calibre Manufacture Morteau 20 (CMM.20), a micro-rotor automatic movement. The exact listed reference is 12.26.20.34.ZN.U4. YEMA’s product page displayed a sale price of $2,490 when reviewed; this is a listed price at that time, not a guarantee of the current price or stock. View YEMA’s listing for reference 12.26.20.34.ZN.U4.
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Dimensions and case material
YEMA specifies a 39 mm case diameter, 47 mm lug-to-lug length, 10 mm thickness and 20 mm lug width. Those figures make the dimensions useful to compare against another watch’s case and strap measurements, but they do not establish how the watch will fit an individual wrist.
The formal specification identifies the case as bronze, consistent with the model name. However, the same product page contains a descriptive passage that calls it a “steel case.” That conflicts with the page’s bronze identification and material specification, so the inconsistency should be clarified with YEMA before purchase if case material is decisive.
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Movement and stated performance
YEMA identifies the movement as its Calibre Manufacture Morteau 20 (CMM.20), a micro-rotor automatic. The company states a 70-hour power reserve and a daily rate of -3/+7 seconds. These are manufacturer specifications from an undated product listing, not independently tested results; the listing does not establish that every example will deliver those figures in use.
Water resistance and supplied strap
YEMA rates the watch at 30 BAR / 300 m / 990 feet and lists a screw-down crown. This is the manufacturer’s rating; it is not evidence here of independent dive testing or a recommendation for any particular underwater activity.
The listed strap is FKM Viton rubber in YEMA’s Scales finish, with a bronze buckle. The listing establishes the supplied configuration, but does not establish separate replacement availability or compatibility with other straps.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare it with other dive watches
Start with the measurements most likely to affect fit: case diameter, lug-to-lug length and thickness. Then compare the case material, movement and stated reserve, water-resistance rating, and supplied strap or bracelet. Bronze is a distinctive material choice; consider whether its appearance as it ages suits your preferences rather than assuming it will look unchanged over time.
Price is another important comparison point: YEMA displayed $2,490 for this reference when reviewed, and that figure may change. Compare current prices and like-for-like specifications, rather than treating the displayed sale price as a permanent price.
Related limited edition: verify the exact variant
YEMA has a separate limited-edition listing with matching headline dimensions, movement and water-resistance figures. It is a related variant, not the exact reference covered here. Before comparing or buying, check that listing for its dial and bezel treatment, edition status, price and terms; matching headline specifications do not make the two listings interchangeable. See YEMA’s related limited-edition listing.
That separate page states a five-year international warranty for watches with a mechanical YEMA Manufacture movement. Confirm the terms, coverage and eligibility that apply to the exact watch, purchase and buyer’s region rather than assuming that warranty statement applies identically to this reference.
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.
