Casio’s CMK-100 makes a strong case for keeping a watch simple: a 38mm titanium case, sapphire crystal, and an automatic movement, without a screen or charging cable in sight. The catch is familiar to mechanical-watch buyers. This won’t keep time as precisely as a quartz Casio. Its roughly 42-hour power reserve means it may stop before Monday if you take it off on Friday evening.
Price: From $320
Where to Buy: Casio
Announced on October 29, 2026, the five-model collection puts those trade-offs inside a field-watch design with large Arabic numerals and a matte dial. U.S. availability is scheduled for November. Casio’s product listing starts at $330, although Casio America’s launch release quotes $320 for the entry-level model, a discrepancy buyers should check before ordering.
Titanium and sapphire in a compact case
The materials are the draw here. Casio pairs a lightweight titanium case and bezel with sapphire crystal, giving buyers two useful durability features without pushing the case beyond 38mm wide. The full dimensions are 44.7 × 38 × 11.4mm, so the width tells only part of the fit story: the case’s length and thickness still deserve a look before buying.
A hairline finish runs across the case and broad, flat-topped bezel. The knurled crown adds a tool-watch detail that also serves a practical purpose when winding or setting the movement. Both the crown and case back use screw-lock construction, and Casio rates the watch for 100-meter water resistance. Follow the company’s water-use guidance rather than treating that number as permission to operate the crown underwater.
Sapphire offers better scratch resistance than mineral glass, not immunity to damage. Casio also uses ion plating and titanium carbide treatments on selected exterior components, with the finish depending on the model.
A readable dial, without the digital extras
Large Arabic numerals give the CMK-100 its field-watch character. Multiple layers of phosphorescent paint build up the markings, while the finely textured matte dial reduces reflections. That’s a more focused approach than adding another complication: three hands, a date window, and room to read them.
Don’t expect the usual electronic Casio toolkit. There’s no alarm, stopwatch, Bluetooth connection, or digital display, and Casio doesn’t state a glow duration in the cited specifications. The appeal is the uncluttered layout, not a promise of all-night visibility.
What the automatic movement asks of you
Inside is a Japanese-made automatic movement with manual winding and hacking seconds, which stops the seconds hand while you set the time. Casio lists 21 jewels, 21,600 vibrations per hour, and magnetic resistance. The cited announcement and product specifications don’t name the movement supplier.
Accuracy is the bigger buying decision. Casio specifies a mean daily rate of minus 20 to plus 40 seconds, a published tolerance rather than a test result for an individual watch. If you want a watch you can set and largely forget, quartz remains the easier choice.
The approximately 42-hour reserve also assumes the mainspring is sufficiently wound. Leave the CMK-100 unworn for around two days and it may stop, so occasional winding and resetting are part of ownership. That’s the mechanical-watch bargain here, not an electronic Casio with a different dial.
Five versions, with a small weight surprise
The lineup changes the dial, finish, and band rather than the core specifications:
| Model | Dial and band | U.S. price |
|---|---|---|
| CMK-100TC-1A | Black dial, nylon strap, additional leather strap | $330 product listing; $320 launch release |
| CMK-100TCC-8A | Gray dial, nylon strap, additional leather strap | $350 |
| CMK-100TL-1A | Black dial, leather strap | $350 |
| CMK-100TCL-5A | Brown dial, leather strap | $375 |
| CMK-100TD-1A | Black dial, titanium bracelet | $440 |
The leather-only models are actually the lightest at 54 grams, narrowly below the nylon versions at 55 grams. Choose nylon for the included second strap, not for a weight advantage. Casio says the vegetable-tanned leather comes from Tuscany, Italy.
At 98 grams, the titanium-bracelet model adds weight but keeps the case and band in the same material. All five versions share the case dimensions, movement, sapphire crystal, and water-resistance rating, so spending more doesn’t buy a different timekeeping specification.
Price: From $320
Where to Buy: Casio
Casio America plans to sell the collection through selected retailers, its online channels, and the G-SHOCK Soho Store in November 2026. For buyers who want a compact mechanical Casio, the CMK-100’s materials and readable dial make it worth considering. Buy it for titanium, sapphire, and automatic timekeeping, not because it improves on quartz accuracy.
