The YEMA Superman Slim CMM.20 is a 39 mm steel dive-style watch with a 9.95 mm-thick case and YEMA’s automatic CMM.20 micro-rotor movement. YEMA specifies 300 m water resistance and approximately 70 hours of power reserve. Prices and stock vary by regional storefront: on 8 October 2026, YEMA Japan listed it at ¥433,400 and marked it sold out, while YEMA’s US collection page showed a $2,790 sale price.
YEMA Superman Slim CMM.20 specifications
| Specification | YEMA listing |
|---|---|
| Case | 316L stainless steel; 39 mm diameter; 9.95 mm thick |
| Lug width | 20 mm |
| Movement | YEMA Manufacture CMM.20 automatic micro-rotor; 33 jewels; 28,800 vibrations per hour |
| Functions | Hours, minutes and seconds |
| Stated rate deviation | −3/+15 seconds per day, maximum |
| Power reserve | Approximately 70 hours |
| Water resistance | 30 BAR / 300 m |
| Crystal | 2.00 mm double-domed sapphire |
| Bezel | Unidirectional diving bezel with sapphire insert and minute scale; YEMA describes its bezel-lock mechanism as patented |
| Bracelet | Brushed 316L stainless steel, double-security folding clasp and diving extension |
These are YEMA’s published specifications, not independently measured results. The rate range and water-resistance rating should therefore be read as manufacturer claims, rather than a guarantee of how an individual watch will perform.
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Case, bezel and dial
A slim profile in the Superman line
YEMA presents this model as a slimmer, more refined version of its Superman design. Its listed 9.95 mm thickness and 39 mm diameter give a useful sense of its proportions; the 20 mm lug width is relevant when choosing a replacement strap.
Dive-watch details
The case is 316L stainless steel, with brushed surfaces and polished sides according to YEMA. The unidirectional diving bezel has a sapphire insert and minute scale. YEMA also identifies the bezel-lock mechanism as a patented feature. The screw-down crown and double-domed sapphire crystal complete the listed construction.
#1 Best Overall
- Blue rubber strap
- Superman logo on dial
- Buckle closure
- Round case
- Silver Arabic numbers 1-12 on dial
The dial is lacquered, and YEMA says the hands and selected markers have luminous treatment. Dial color or reference-specific variations should be checked on the listing for the particular watch being considered.
CMM.20 movement and stated performance
The CMM.20 is an automatic micro-rotor movement that YEMA calls its Manufacture caliber. Its listed specifications are 33 jewels, a frequency of 28,800 vibrations per hour, and time display with hours, minutes and seconds. YEMA gives a maximum rate deviation of −3/+15 seconds per day and approximately 70 hours of power reserve.
Those numbers describe the manufacturer’s specifications; the sources available do not establish independent accuracy testing or dive testing for this exact model. Actual timekeeping can vary between watches and with wear, position and service condition.
Water resistance: what 300 m means here
YEMA rates the Superman Slim CMM.20 at 30 BAR / 300 m. That is the manufacturer’s stated rating, not independent evidence that a particular watch has passed a dive test. For a watch intended to be exposed to water, the condition of the crown, seals and case matters; have water resistance checked periodically, especially after service or impact.
Price and availability by market
| Market or context | Displayed price | Availability and date |
|---|---|---|
| YEMA Japan official listing | ¥433,400 | Marked sold out when observed on 8 October 2026 |
| YEMA official US collection page | $2,790 sale price | Displayed on 8 October 2026; stock status not stated here |
| Launch retail price | €2,490 | Historical launch price reported on 13 February 2024 |
These are separate regional and historical price references, not interchangeable conversions or a single current worldwide price. Storefront prices and stock can change, so check the relevant market’s official listing before buying.
Can you fit another strap?
The listed lug width is 20 mm, and the watch is supplied on a steel bracelet. That measurement alone does not confirm that any generic 20 mm strap will fit: the strap’s end shape and attachment hardware also need to match the exact case and reference. Confirm compatibility for the specific watch before ordering.
Who should consider it?
The watch is most relevant to buyers who want a relatively compact, thin Superman-family design paired with an automatic micro-rotor movement and a steel bracelet. Its published dive rating, movement specifications and regional pricing are useful points for evaluation, but they should be weighed as YEMA’s claims and listings rather than independent performance findings. For a comparison with another watch, line up case diameter and thickness, movement architecture and stated reserve, water-resistance rating, bezel and crystal, bracelet fit, dial variant, and price in the same market and date window.
Quick Recap
Official listings and launch coverage
- YEMA official Superman collection
- YEMA Japan Superman Slim CMM.20 listing and specifications
- YEMA official Spanish-language Superman collection
- Time and Watches launch report, 13 February 2024
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.
