The closest official match for “Yema Superman Skin Diver Slim” is the YEMA Skin Diver Slim CMM.20 Limited Edition. YEMA lists a 39 mm steel case that is 10 mm thick, its automatic CMM.20 micro-rotor movement with a 70-hour power reserve, and water resistance of 300 m. These are manufacturer specifications, not independent test results.
YEMA Skin Diver Slim CMM.20 specifications
| Specification | YEMA’s stated details |
|---|---|
| Case | 39 mm diameter; 10 mm thick; 316L stainless steel with vertical brushing and a polished bevel |
| Lug width | 20 mm |
| Crystal | 2.20 mm double-domed sapphire |
| Movement | Automatic Micro-Rotor Caliber Manufacture Morteau 20 (CMM.20); 28,800 A/h |
| Power reserve | 70 hours |
| Daily rate | -3/+7 seconds, as specified by YEMA |
| Bezel | Unidirectional diving bezel with sapphire insert, white 0–60 markers, and luminous 12 o’clock marker |
| Water resistance | 30 BAR / 300 m / 990 ft |
| Dial and hands | Lacquered dark gray dial; applied polished steel markers and hands; Super-LumiNova C3 Grade A |
| Bracelet | Brushed 316L Scales Slim steel bracelet |
| Crown | Screw-down, with embossed YEMA logo |
Specifications are listed on YEMA’s official product page and its US storefront page.
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RATIO FreeDiver Sapphire Crystal Diver Watch Japanese Automatic Dive Watch 200m Water Resistant... | $130.00 | Buy on Amazon |
Case, proportions, and crystal
The 39 mm diameter and 10 mm thickness give the watch a relatively compact specification for a dive-style model. The 20 mm lug width is useful when looking for replacement straps, but width alone does not confirm that a particular third-party strap or bracelet will fit: attachment style, end-link shape, and clearance also matter.
YEMA specifies a vertically brushed 316L steel case with a polished bevel and a double-domed sapphire crystal. The stated crystal thickness is 2.20 mm. These details describe the listed construction; they do not establish how the watch wears on an individual wrist.
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- JAPANESE AUTOMATIC MOVEMENT WITH SELF-WINDING PERFORMANCE - Reliable mechanical precision.
- SAPPHIRE CRYSTAL WATCH WITH PREMIUM DURABILITY - Scratch resistance and excellent clarity.
- STAINLESS STEEL PROFESSIONAL DIVER WATCH DESIGN - Rotating bezel, luminous markers and bold styling.
- BUILT FOR ADVENTURE, TRAVEL AND DAILY STYLE - Performance and timeless diver aesthetics.
CMM.20 movement and stated accuracy
The watch is powered by YEMA’s automatic Micro-Rotor Caliber Manufacture Morteau 20 (CMM.20). The manufacturer lists a frequency of 28,800 A/h and a 70-hour power reserve. Its specified daily rate is -3/+7 seconds. Treat these figures as YEMA’s published specifications rather than independently verified performance measurements.
Bezel, water resistance, and lume
YEMA specifies a unidirectional bezel with a sapphire insert and white 0–60 graduation. Its 12 o’clock marker is luminous. The screw-down crown and stated 30 BAR / 300 m / 990 ft water-resistance rating are also part of the manufacturer’s specification.
A depth rating is a specification, not a blanket guarantee for every use or condition. Follow YEMA’s instructions for crown and bezel use, and have seals and water resistance checked as appropriate before exposing the watch to water.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Dial, bracelet, and design positioning
The limited edition has a lacquered dark gray dial, applied polished steel markers, and polished steel hands. YEMA lists Super-LumiNova C3 Grade A on the hands and markers. It comes on a brushed 316L Scales Slim bracelet.
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YEMA describes the watch as a modern interpretation of its 1960s skin divers and calls out its “vintage vibe” and “distinctive retro flair.” That is the manufacturer’s design positioning, not an independent assessment.
Warranty and purchase checks
YEMA’s US storefront says watches equipped with a mechanical YEMA Manufacture movement receive an extended international warranty period of five years. The page excerpt does not specify the detailed terms or exclusions, nor does it establish that the same coverage applies in every country or through every seller. Check the warranty terms for your region and purchase channel before buying.
Quick Recap
- Confirm that the listing identifies the exact Skin Diver Slim CMM.20 Limited Edition variant.
- Check current price and stock with the seller; neither is established here.
- If buying outside the US, verify the warranty duration and conditions that apply to your location and seller.
- For a replacement strap, use the stated 20 mm lug width as a starting point and confirm the exact fit with the strap maker or seller.
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.
