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- Casio has unveiled the CMK-100, its first mainline automatic, following the Edifice EFK-100’s mechanical debut in 2025.
- The five-model range combines a 38 mm titanium case, textured dial, sapphire crystal and 100-metre water resistance, with titanium, nylon and leather band options from USD $330 (AUD $470).
- Its Made-in-Japan movement offers a 42-hour power reserve and a stated accuracy tolerance of −20 to +40 seconds a day.
Well, isn’t this just delightful? The new Casio CMK-100 is a stunningly simple field watch that also happens to be the first automatic in the brand’s mainline collection. It’s a milestone moment for the Japanese brand, and they’re celebrating in the most subdued way possible. A wide titanium bezel frames a textured dial with three hands, a date window and luminous numerals. No elaborate complications or unnecessary flourishes. Casio understands that a field watch is a tool first. And yet, I’m sitting here admiring them all the same.
Casio had already ventured into mechanical watches with the Edifice EFK-100 in 2025, a sportier, motorsport-inspired model that also teamed up with Toyota Racing for a China-exclusive forged carbon-fibre edition. The CMK-100 isn’t here to do laps around the race track like the Edifice. Casio is taking a different route, following the field-watch tradition of legibility, durability and simplicity across five different models.
Stripped back to its core functions, it still packs plenty of substance beneath its modest appearance. The CMK-100 has a titanium case, sapphire crystal and 100-metre water resistance, with a screw-lock crown to help keep the elements out. Its mechanical movement asks a little more of its owner than the quartz Casios we’re accustomed to, but the overall package looks rather convincing for everyday wear, just with the added twist of the crown.
A Field Watch That Understands the Assignment
The CMK-100 measures 38 mm across, 44.7 mm from lug to lug and 11.4 mm thick. Sensible dimensions for a field watch, particularly with that broad, flat-topped bezel giving the relatively compact case a little more presence on the wrist. The fine hairline finish on the titanium case and bezel keeps the metalwork understated, while ion plating and a titanium carbide coating help protect against everyday abrasion. It’s a neat balance of visual restraint and practical durability.
A knurled screw-lock crown, screw-back case and scratch-resistant sapphire crystal add to its practical credentials. Nothing extravagant, but these are the details you’d want in something intended to be worn out in the field rather than kept looking pretty in the watch box.
And what a dial. Casio uses a fine stamped texture to reduce reflections, with large Arabic numerals at 12, 9 and 6 o’clock and simple markers between them. Multiple layers of luminous paint give the numerals a raised, almost three-dimensional appearance, while the hands and markers remain readable in low light. A date window sits at three, keeping things remarkably tidy across all five variations.
Five Takes on the Same Automatic Field Watch
The underlying specifications remain the same across all five models, but the different case finishes, dial colours and straps give each a distinct personality. Silver sets the tool-watch baseline, while the darker, copper-toned options are a tempting choice for something a bit more formal.
1. CMK-100TD-1A: Titanium Bracelet
Starting with the most straightforward of the lot, the CMK-100TD-1A pairs a silver-tone titanium case with a matching bracelet and black dial. The result is a clean, cohesive everyday tool watch that doesn’t pretend to be anything flashier. At 98 g, it’s the heaviest of the five, although that’s still a fairly modest weight for a watch on a metal bracelet.
2. CMK-100TC-1A: Black Nylon
Swap the bracelet for a black nylon strap, and the CMK-100 becomes a more traditional field watch, shedding plenty of weight in the process. The silver case and black dial stay put, but the woven strap makes the whole thing look like it’s waiting to be knocked around on the job rather than dressed up after work.
3. CMK-100TCC-8A: Gunmetal and Grey
A touch darker than the standard silver, the gunmetal-toned case and grey dial are paired with a matching grey nylon strap. It’s a moodier, almost tactical take on the CMK-100, with the darker finish giving the broad bezel a different character. Yet the bright numerals and hands still stand out against the dial, keeping the same easy-to-read layout.
4. CMK-100TL-1A: Black Leather
Casio keeps the silver-tone case and black dial but swaps the stark white markers for warmer, tan-coloured numerals, indexes and hand details. Paired with a black leather strap, it’s a small change that softens the military-inspired design just enough to make this one look rather dashing.
5. CMK-100TCL-5A: Copper and Brown Leather
And then there’s the copper, my favourite of the bunch. With its copper-toned case, chocolate-brown dial and matching leather strap, the CMK-100 takes on an almost entirely different personality. The warm metal finish makes that broad bezel look particularly handsome, while the raised white numerals keep the dial from getting lost among all those earthy tones. For a watch built around simplicity, this one punches well above its price-point weight. It’s got character to spare without compromising the field-watch formula.
1/6Mechanical Charm Comes With a Compromise
Inside is a Made-in-Japan automatic movement with 21 jewels, a frequency of 21,600 vibrations per hour and approximately 42 hours of power reserve. It winds through wrist movement or manually, and the hacking function stops the seconds hand for accurate setting. Casio hasn’t identified the exact calibre or manufacturer.
However, with a mean daily rate of −20 to +40 seconds, a watch consistently running at either end of that range could gain four minutes and 40 seconds over a week, or lose two minutes and 20 seconds. Your mileage may vary, but wear this often enough, and even with the automatic movement keeping things spinning, you’ll want to readjust, or else you might miss the bus.
That said, it’s familiar territory for an automatic movement this accessible. Leave it unworn beyond its 42-hour power reserve, and you’ll need to wind it up and set the time again. Such is the trade-off with mechanical timekeeping, even in a watch built for everyday use.
Casio CMK-100 – Key Specifications
- Case Material: Titanium
- Case Length: 44.7 mm
- Case Width: 38 mm
- Case Height: 11.4 mm
- Crystal: Sapphire
- Water resistance: 100 metres
- Movement: Japanese automatic, manual winding and hacking
- Power reserve: Approximately 42 hours
- Accuracy: −20 to +40 seconds per day
- Band options: Titanium bracelet, nylon or leather
Scheduled to arrive in the US this November, the CMK-100 range starts at USD $330 (roughly AUD $470) for the black nylon version and rises to USD $440 (roughly AUD $626) for the titanium bracelet. Australian pricing and availability have not been confirmed.
It’s hard to make a watch this simple look quite so good. Casio has managed it without dressing the CMK-100 up as something it isn’t, and I’d happily put up with the occasional twist of the crown for a field watch that gets so much else right. Especially that copper one. Yes, please.
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