The Mk II Stingray II Keroman is a 40 mm automatic dive watch inspired by a 1950s Marine Nationale-issued design. Its 200 m water-resistance rating and Mk II’s limited testing claim should not be mistaken for full ISO 6425 compliance: Mk II says it tests the water-resistance portion of that standard, and an independent review says the watch is not officially ISO 6425 certified.
What the Keroman name and design refer to
Mk II describes the Stingray as a homage to a dive-watch design issued to the French Marine Nationale in the 1950s. The Stingray II revives a model the company produced earlier. Mk II says the newer case was reduced from 42 mm to 40 mm while retaining details drawn from military dive-watch cases and the brand’s own experience.
“Keroman” refers to a peninsula near Lorient, France. In its review, Fratello connects the name with a German submarine base built during World War II and later repurposed by the French Navy. That historical context comes from the independent review, rather than Mk II’s product specifications.
Dimensions and wrist fit
| Specification | Mk II listing |
|---|---|
| Case width | 40.00 mm |
| Thickness | 14.70 mm |
| End-to-end length | 48.50 mm |
| Lug width | 20.00 mm |
| Weight | 84 g |
Fratello’s reviewer reported that the watch fit their 16 cm wrist. That is a single wearer’s experience, not a guarantee of fit; the 48.50 mm end-to-end measurement and 14.70 mm thickness are useful figures to compare with a watch you already wear.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- Versatile Dive Modes: Dive into fall adventures with the Cressi Leonardo 2.0, a dive computer watch featuring Air, Nitrox, and Gauge modes. This scuba diving watch adapts seamlessly to diverse setups, making it perfect for autumn's cooler underwater explorations
- Simplified Control Interface: Navigate menus effortlessly with the single-button interface of this diving watch. Its intuitive design ensures that even in the brisk fall waters, you maintain straightforward control over your dive settings
- Quick Critical Alerts: Stay alert with visual and audible alarms that quickly notify you of essential dive data. As fall brings new underwater challenges, these alerts ensure your safety and preparedness during every scuba diving experience
- Seamless Device Integration: Pair your dive computer watch with iOS and Android devices for comprehensive dive tracking. Whether you're analyzing autumn dives from your smartphone or tablet, cross-platform compatibility ensures seamless connectivity
- Efficient Data Management: Transfer dive logs easily with USB and infrared capabilities, allowing for detailed analysis. Even as the fall season introduces new diving conditions, managing your scuba diving computer data remains efficient and thorough
Movement and everyday operation
Mk II lists a Japanese SII NE15 automatic movement with a quickset date, hacking seconds and manual winding. It gives a 50-hour power reserve. Fratello identifies the caliber as the Seiko NE15C and reports a frequency of 21,600 vibrations per hour, as well as the same 50-hour reserve. The power-reserve figure is the stated specification, not a guarantee of how long every individual watch will run under every condition.
Case, crystal, bezel and lume
- Case: bead-blasted 316L stainless steel.
- Crystal: double-domed sapphire with an interior anti-reflective coating.
- Crown: recessed, screw-down design with two gaskets.
- Bezel: 120-click, unidirectional construction.
- Bezel inlay: offered in aluminum or vintage-style acrylic.
- Lume: green-emission Arclite Super-LumiNova.
The sources establish the two inlay materials and their styling difference, but do not establish that one is more durable than the other. Choose based on the look and material you prefer rather than assuming a performance advantage.
Rank #2
- WATCH-STYLE DIVE COMPUTER - Built for both recreational and extended range divers, the Mares Sirius wrist dive computer offers versatile features to suit all levels of scuba diving; the color-coded tank pressure system allows for quick, at-a-glance readings, ensuring divers stay informed during their dives
- ZH-L16C ALGORITHM - The Mares Sirius Dive Computer features the ZH-L16C algorithm with gradient factors and predictive multigas capabilities that supports up to five gas mixes, including nitrox and trimix; this functionality is perfect for extended range divers who require precise gas management on more complex dives
- MIP COLOR, HIGH-RESOLUTION DISPLAY - The Sirius dive computer's MIP color, high-resolution display ensures that all critical data is easy to read, even in challenging underwater conditions, offering exceptional clarity at any depth in the ocean; the Sirius watch-style dive computer features three watch faces plus color options
- FULL TILT DIGITAL COMPASS - The Mares Sirius Watch-Style Wrist Dive Computer incorporates the full tilt digital compass, which comes with bearing memory and a built-in stopwatch, making navigation during a dive straightforward and accurate; the hoseless tank data integration supports up to five transmitters, enabling divers to monitor multiple tanks with ease
- FUNCTIONAL DIVE ACCESSORY- The 100-dive logbook captures multiple graphs, including detailed tissue saturation & dive profile graphs, allowing divers to analyze their performance post-dive; smart battery management system with 30 hours dive time per full charge; bluetooth connection for direct connection to a smartphone; underwater menu allows certain settings to be changed during the dive
What 200 m water resistance does—and does not—mean
Mk II specifies 20 ATM / 200 m water resistance and says each watch is wet-tested for water resistance and thermal shock. The manufacturer explicitly limits its ISO 6425 testing claim to the water-resistance portion of the standard. Fratello likewise states that the Stingray II is not officially ISO 6425 certified. It is therefore inaccurate to describe it as an ISO-certified diver on the evidence available.
A depth rating and full dive-watch standard compliance are different claims. The 200 m figure is Mk II’s stated water-resistance rating; it does not establish that the watch has passed every requirement in ISO 6425. Buyers who require formal certification should look for a maker’s explicit certification statement rather than treating the rating alone as proof.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Rank #3
- Specifications: Model: SD1963 Brand: Steeldive Case Size (without crown):42mm Case Length:51mm Case thickness: 13mm Lug Size:22mm (if you wanna change strap, please choose 22MM )
- Case material: 316L stainless steel Dial Size: 33.00*32.50*30.50*0.40mm Watch bezel: Ceramic/ Size: 40.50*33.00*1.20mm Watch glass: Sapphire/ Size: 31.50*2.50mm Hands Size: 9.50*14.00*14.50mm
- Movement: NH35 automatic movement Waterproof: 200MM / 20ATM/ 20 Bar Packing: Gift box/ T a g/ Warranty Card/ Manual
Aluminum or acrylic: what to check before buying
The main stated configuration choice is the bezel inlay: aluminum or vintage-style acrylic. Current stock and pricing can change. Mk II’s Ready to Wear collection currently marks the aluminum version sold out and lists it from $805.50; check the live collection before making a purchase decision. The product page also presents a scratch-and-dent listing and a future-release note dated October 2024, neither of which establishes a current restock date.
For context only, Fratello’s June 21, 2023 review gave historical retail prices of US$895 for the aluminum version and US$940 for acrylic. Those dated figures are not current price guidance.
Quick Recap
Best Value
- 10 ATM water resistant, support 100m underwater operation, great for swimming, snorkeling, scuba diving and other water activities.
- Support stopwatch, timer count down, Alarm clock, and hourly chime functions.
- Support month, date, week day check.
- Support dual time zone display, 12/24 hour format selectable.
- Electro luminescent backlight built-in, support time check in the darkness. Note: The battery can be replaced. If you find that the watch is not working or the text on the display is not clear, please replace the watch battery in time.
Rank #4
- Colors: Black/ Green/ Blue Case Size (without crown):45mm Case Length:47.7mm Case thickness: 13.3mm Lug Size:22mm
- Case material: 316L stainless steel Watch bezel: Ceramic, Unidirection 120 Clicks Bezel Size:39.00*32.20*1.20mm Watch glass: Sapphire
- Glass Size:32.00*3.10mm Dial Size:29.30*29.00*28.00*0.40mm Movement: NH36 automatic movement Waterproof: 200MM / 20ATM/20 Bar
Is the Stingray II Keroman a fit for you?
- Consider it if you want a compact-for-a-dive-watch 40 mm case, appreciate military-watch design history, or prefer the choice of aluminum and vintage-style acrylic bezel inlays.
- Check the dimensions carefully if thickness or end-to-end length matters to your wrist fit; the case is 14.70 mm thick and 48.50 mm long.
- Look elsewhere if your purchase requires documented full ISO 6425 certification; Mk II’s stated testing is limited to water resistance.
- For a strap change, the listed lug width is 20 mm. Confirm strap attachment style, material and length, as well as your own fit preference; no third-party strap is specifically verified here.
Sources and current details
- Mk II Stingray II Keroman product page — manufacturer specifications and testing description.
- Mk II Stingray story page — the brand’s account of the design inspiration.
- Fratello’s June 21, 2023 review — independent hands-on impressions and historical prices.
- Mk II Ready to Wear collection — current listing status and price, which may change.
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.
