MWC 100ATM Professional Military Diver’s Watch Case to Create an Autom

MWC 100ATM Professional Diver’s Watch Case

Build Your Own Timepiece — Engineered for the Extreme

Take control of your next build with this professional-grade 100ATM dive watch case, purpose-built for those who demand precision and resilience. Machined from solid 316L stainless steel with a sapphire crystal, and a helium escape valve, this case is engineered for divers operating at extreme depths — including those using mixed gases.

Perfect for custom builds, personal projects, or professional assembly, it’s a military-grade foundation ready to become your next mission-ready watch.
(Movement not included.)

Please Note: The final 2 images show two typical examples of how one of these watches could look when assembled although of course much will depend on your choice of dial etc.

🧩 Compatible Automatic Movements

This case fits a wide range of automatic movements, including:

• ETA-2824-2
• Sellita SW200-1
• SwissTP STP1-11
• Seagull ST2130
• Hangzhou 6301
• Valanvron VAL-24
• HK Precision PT5000
• Liaoning Peacock SL-3000
• Ginault 7275
• Landeron L24
• Soprod P024

🧰 Case & External Components

Built to Protect and Perform

• Case: 316L stainless steel
• Caseback: Solid screw-down rear cover
• Crystal: Sapphire with dual anti-reflective (AR) coating
• Crown: Screw-down locking crown
• Helium Escape Valve: Automatic pressure release during decompression
• Spring Bars:
  
• Strap: 24 mm NATO webbing (included free) 

🌊 What Makes This Case Exceptional

💪 Extreme Performance

This isn’t just a watch case — it’s a platform built for survival.
With 100ATM / 1000 m (3280 ft) water resistance, a sapphire crystal, and a tactile bezel, it’s engineered to perform in arctic cold, tropical humidity, and deep-sea pressure alike.

Unlike most military diver designs with 20 mm straps, this case accepts a 24 mm NATO strap for superior wrist stability in high-stress or high-impact conditions.

🛠 Helium Escape Valve — A Deep-Dive Essential

During saturation dives, microscopic helium molecules can enter the case under pressure. As the diver ascends, internal pressure builds — risking crystal failure.
This case’s automatic helium valve safely vents that pressure during decompression, keeping your timepiece intact and dive-ready.

🧪 Why Helium Matters

Professional divers often breathe helium-oxygen mixtures at depth to avoid nitrogen narcosis. The trade-off is helium infiltration — and without a proper escape valve, pressure damage is inevitable.
That’s why this feature is standard in every true professional-grade dive watch.

⚙️ Technical Specifications

💎 Why Sapphire Crystal?

Sapphire is the hardest and most resilient crystal used in watchmaking — second only to diamond.
It’s scratch-proof, shatter-resistant, and thermally stable. Over 90% of crystal failures occur in mineral glass, not sapphire.

Built for the Harshest Realities. Trusted by Professionals.

From special forces to saturation divers, this case has the pedigree to handle real-world missions — and the polish to look at home anywhere from the ocean floor to the boardroom.

When your gear matters, build something that lasts.