⏱ 7-9 min read
📅 Updated Nov 2026
🔍 1 Watch Reviewed
The Casio CMK-100 is a series of five automatic field watches. Each has a 38 mm titanium case, a sapphire crystal, 100-meter (10 bar) water resistance and a Made-in-Japan automatic movement with roughly 42 hours of power reserve. You can choose a titanium bracelet, a cloth strap or Tuscan leather. The CMK-100TD-1A, on the titanium bracelet, is the flagship.
Casio built its name on quartz accuracy, digital displays and watches that survive drop tests. So a titanium automatic with a sapphire crystal feels like a plot twist. It is also one of the more interesting watch launches of fall 2026, and it’s aimed at people who want a first mechanical watch without a luxury price tag.
This guide covers the specs, the five models, the real-world trade-offs and the questions buyers ask most.
📅 Updated Nov 2026
🔍 1 Watch Reviewed
Casio built its name on quartz accuracy, digital displays and watches that survive drop tests. So a titanium automatic with a sapphire crystal feels like a plot twist. It is also one of the more interesting watch launches of fall 2026, and it’s aimed at people who want a first mechanical watch without a luxury price tag.
This guide covers the specs, the five models, the real-world trade-offs and the questions buyers ask most.
Casio CMK-100 At a Glance
| Feature | Specification |
|---|---|
| Collection | CASIO AUTOMATIC |
| Case material | Titanium with ion plating (IP) and titanium carbide (TiC) coating |
| Case size | 38 mm diameter, 11.4 mm thick |
| Crystal | Scratch-resistant sapphire |
| Water resistance | 10 bar (100 m) |
| Crown and case back | Screw-lock construction |
| Movement | Made-in-Japan automatic with magnetic resistance |
| Winding | Automatic, plus manual winding |
| Power reserve | Approximately 42 hours |
| Mean daily rate | -20 to +40 seconds |
| Functions | Three hands, date display, hacking seconds hand |
| Band options | Titanium bracelet, cloth strap, vegetable-tanned leather strap |
| Models | 5 |
What is the Casio CMK-100?
The CMK-100 belongs to the CASIO AUTOMATIC collection, which Casio describes as bringing mechanical watch craftsmanship to everyday life. The design follows the field-watch tradition: durable timepieces conceived as tools, with a readable dial, a comfortable fit and no fuss. Launch coverage has pitched the series as Casio’s first mainline automatic, following the Edifice-branded EFK-100.
In practice that means three hands, a date window, a flat-topped bezel and a case compact enough for most wrists. There is no solar panel, no Bluetooth and no alarm. The appeal is the mechanism itself.
The Titanium Case: Light, Tough And Built For Daily Wear
The CMK-100 uses a titanium case with a flat-top, wide bezel. Titanium combines strength and lightness with excellent corrosion resistance, which is why it’s a favorite for tool watches. Casio adds ion plating and a titanium carbide coating to improve abrasion resistance. No coating makes a watch scratch-proof, but it helps the case stand up to everyday knocks.
The crown and the case back both use a screw-lock construction for a tighter seal. The sides of the crown have a non-slip knurled finish, so it’s easy to grip when you wind or set the watch.
A few fit details worth knowing:
• Diameter: 38 mm, a classic field-watch size.
• Thickness: 11.4 mm.
• Lug-to-lug: about 44.7 mm, according to launch coverage, so check this number against your wrist.
• Weight: launch coverage lists the strap versions at about 54–55 g and the titanium-bracelet CMK-100TD-1A at about 98 g.
One small honest note from Casio: because the case back is screw-lock, the logo and lettering on it may not line up perfectly with the dial.
The Dial: Built To Be Read At a Glance
A field watch lives or dies on legibility. The CMK-100 dial has a finely textured finish created with a special stamping process, paired with a simple layout of three hands and a date display. The large Arabic numerals are printed with multiple layers of phosphorescent paint, which gives them a three-dimensional look that blends into the texture of the dial.
The sapphire crystal helps here too. It is highly transparent and scratch resistant, so the dial stays clear and the glass resists the daily abuse that would cloud a cheaper crystal.
The Movement: What “Automatic” Really Means
An automatic watch winds itself from the motion of your wrist. There’s no battery to replace. The CMK-100’s Made-in-Japan movement also supports manual winding, so you can top it up with the crown when you pick it up after a few days.
Three specs matter most in daily use:
• Power reserve of about 42 hours. If you take the watch off on Friday evening, it should still be running on Sunday morning.
• Hacking seconds hand. Pulling the crown stops the seconds hand, so you can set the time precisely against a reference clock.
• Magnetic resistance. Everyday magnets from phones, laptops and bags are less likely to throw off timekeeping.
Launch coverage also cites 21 jewels and a beat rate of 21,600 vibrations per hour (3 Hz). Casio lists a mean daily rate of -20 to +40 seconds.
Be realistic about accuracy. That rate is normal for a mechanical watch but it’s not quartz-level precision. If you want a watch that never needs a time check, a quartz or solar Casio is the better tool. If you enjoy the mechanical experience, the CMK-100 is the point.
Water Resistance: 100m With a Screw-Lock Crown
The CMK-100 is rated to 10 bar, or 100 meters. Combined with the screw-lock crown and screw-back case, that’s enough for rain, handwashing and swimming, as long as the crown is fully screwed down before the watch gets wet. Always check the owner’s manual for Casio’s guidance on water use.
Five Models, Three Band Styles
All five CMK-100 models share the same case size, movement, sapphire crystal and water resistance. The differences are the dial, the finish and the band, so a higher price doesn’t buy different timekeeping.
| Model | Band | Look | Price* |
|---|---|---|---|
| CMK-100TC-1A | Black cloth | Titanium case, black dial | $330 |
| CMK-100TCC-8A | Grey cloth | Grey IP titanium, grey dial | $350 |
| CMK-100TL-1A | Black Tuscan leather | Titanium case, black dial | $350 |
| CMK-100TCL-5A | Brown Tuscan leather | Bronze-tone IP, brown dial | $375 |
| CMK-100TD-1A | Titanium bracelet | Titanium case, black dial | $440 |
*Prices come from launch coverage and can change. Check Casio’s site for current pricing and availability.
How to Choose Your Band
• Cloth: the lightest, most casual option. Casio uses a thick nylon that gives a secure fit and holds up well. It’s also the easiest strap to swap later.
• Leather: the dressier choice. Casio uses vegetable-tanned leather sourced from Tuscany, Italy, which is designed to get more comfortable and develop character over time.
• Titanium bracelet: the most substantial look, matching the case, with a one-touch three-fold clasp reported at launch.
Spotlight: Casio CMK-100TD-1A (titanium bracelet)
The CMK-100TD-1A is the model to pick if you want the full titanium look. The bracelet matches the structure of the case for a unified design, and Casio describes it as pairing a substantial appearance with a lightweight, comfortable fit. It also costs the most of the five and is the heaviest, at about 98 g, so try to compare it on your wrist against a strap version if you can.
Who Should Buy the Casio CMK-100?
It’s a strong fit if you:
• want a first mechanical watch from a brand you already trust
• like the field-watch look: simple dial, big numerals, date at 3 o’clock
• want titanium and sapphire without moving into luxury-brand pricing
• need a watch that handles daily wear and swimming
You might skip it if you:
• need quartz-level accuracy
• want solar power, atomic timekeeping or smart features
• want a chronograph or other extra complications
• prefer a very thin watch, since it’s 11.4 mm thick
Pros And Cons At a Glance
Pros
• Lightweight titanium case with IP and TiC coating
• Sapphire crystal
• 10 bar water resistance with screw-lock crown and case back
• Hacking seconds and manual winding
• Five model choices across three band materials
Cons
• Mechanical accuracy of -20 to +40 seconds per day
• Power reserve of about 42 hours, so it will stop if left unworn for a few days
• Date is the only complication
• The titanium bracelet version is nearly twice the weight of the strap versions
Living With an Automatic: Three Quick Tips
1. Wear it regularly, or wind it by hand. Give it a few turns of the crown if it has been sitting.
2. Set the time with the hacking function. Pull the crown out, wait for the reference time, then push it in.
3. Always screw the crown down. That’s what protects the 100 m water resistance.
For exact setting steps, check the Casio watch manuals.
Casio CMK-100 FAQ
Is the Casio CMK-100 an automatic or quartz watch?
It’s an automatic. The Casio CMK-100 uses a Made-in-Japan automatic movement that winds from wrist motion and also supports manual winding.
What size is the Casio CMK-100?
The case is 38 mm in diameter and 11.4 mm thick. Launch coverage lists the lug-to-lug length at about 44.7 mm.
Is the Casio CMK-100 made of titanium?
Yes. The case is titanium, finished with ion plating and titanium carbide coating for added abrasion resistance. The CMK-100TD-1A also has a titanium bracelet.
Does the CMK-100 have a sapphire crystal?
Yes. All five models use a scratch-resistant sapphire crystal.
How water resistant is the Casio CMK-100?
It’s rated to 10 bar (100 meters), with a screw-lock crown and screw-back case. Make sure the crown is fully screwed down before getting the watch wet.
What is the power reserve of the Casio CMK-100?
Approximately 42 hours when fully wound.
How accurate is the Casio CMK-100?
Casio lists a mean daily rate of -20 to +40 seconds. That’s typical for a mechanical watch and less precise than quartz.
How many Casio CMK-100 models are there?
Five: CMK-100TD-1A, CMK-100TC-1A, CMK-100TCC-8A, CMK-100TL-1A and CMK-100TCL-5A.
Which CMK-100 should I buy?
Choose the TC-1A for the lightest and most affordable option, the TL-1A or TCL-5A for leather, the TCC-8A for a grey look, and the TD-1A for the full titanium bracelet.
Where can I buy the Casio CMK-100?
Casio lists the series on its official US site, and you can find the models through the CMK-100 product page.
Final Verdict
The Casio CMK-100 is a focused watch. It doesn’t try to out-feature a G-Shock or out-measure a quartz. Instead it offers a light titanium case, a sapphire crystal, 100 m of water resistance and a self-winding Japanese movement, in a 38 mm field-watch package. If you’ve wanted to try a mechanical watch from a brand with serious durability credentials, it’s an easy one to shortlist. Just go in knowing that mechanical timekeeping is a charming habit, not a precision upgrade.
[photo credits: www.casio.com]
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