SKU: 56516486341

MWC 100ATM / 3,280ft / 1000m Water Resistant Diver's Watch Stainless Steel Case with Helium Valve and Matching Bracelet 100% Swiss Made with Sellita SW200 26-Jewel Automatic Movement

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Description

MWC 100ATM / 3,280ft / 1000m Water Resistant Diver's Watch Stainless Steel Case with Helium Valve and Matching Bracelet 100% Swiss Made with Sellita SW200 26-Jewel Automatic MovementSKU: 100AT SS BB 200 MWC "Depthmaster" 100ATM Military Diver Watch Introducing the MWC "Depthmaster" 100ATM Military Diver Watch, one of our latest and most robust models. This 100% Swiss made diver's watch is designed to endure extreme conditions, featuring a sapphire crystal and a 100ATM (1,000 meters 3,280 feet) water resistance rating. It is suitable for diving with mixed gases at extreme depths and includes a wider 24mm bracelet and a non scratch

SKU: 100AT/SS/BB/200

MWC "Depthmaster" 100ATM Military Diver Watch

Introducing the MWC "Depthmaster" 100ATM Military Diver Watch, one of our latest and most robust models. This 100% Swiss-made diver's watch is designed to endure extreme conditions, featuring a sapphire crystal and a 100ATM (1,000 meters / 3,280 feet) water resistance rating. It is suitable for diving with mixed gases at extreme depths and includes a wider 24mm bracelet and a non-scratch ceramic bezel, making it easier to grip in extreme cold. These watches are specifically crafted for professional divers facing very challenging conditions.

Helium Escape Valve

All MWC 100ATM models come equipped with a helium escape valve. This feature addresses the issue of helium molecules entering the watch. Helium molecules are extremely small, allowing them to penetrate the watch seals even when other gases and water cannot. This can occur in saturation diving, where divers spend extended periods at great depths under high pressure.

Helium buildup inside the watch can create internal pressure, potentially causing serious damage or even blowing out the crystal or crown when unscrewed. This is particularly dangerous during time checks or resets. The helium escape valve automatically releases these molecules during decompression, ensuring the watch returns to normal sea level pressure without letting any external elements in.

Importance of Helium in Deep Diving

Helium is crucial for deep-sea diving because it does not cause nitrogen narcosis, unlike nitrogen. Helium replaces nitrogen in most deep-sea mixed gas diving applications. Professional divers working at great depths for extended periods often live in dry environments pressurized with an oxygen/helium mix. Upon surfacing and decompressing, this gas must be safely removed to avoid potentially hazardous situations like the crystal or crown being blown out, which could cause injury.

Specifications

  • Movement: High-quality Sellita SW200, 28,800 bph, 26 Jewels, 38-hour power reserve with hacking function
  • Water Resistance: 100ATM / 3,280ft / 1,000m
  • Crown: Screwdown locking
  • Helium Escape Valve: Yes
  • Dimensions:
    • Width: 45mm
    • Thickness: 15.8mm
  • Bezel Type: Unidirectional Non-Reflective with Ceramic Insert
  • Crystal Type: Sapphire with Anti-Reflective Coating*
  • Case: 316L Stainless Steel
  • Illumination: Super Luminova on markers, hands, and bezel
  • Bracelet: 24mm  stainless steel

Benefits of Sapphire Crystal

Synthetic sapphire is the best material for watch crystals due to its exceptional strength and resistance to shattering and scratching. These properties make it highly appealing to military and security personnel, police officers, and individuals with active outdoor lifestyles, accounting for over 70% of our customers. In comparison, over 90% of cracked crystal incidents involve watches with mineral glass crystals. Even hardened mineral crystals cannot match the durability of sapphire under adverse conditions.

Sapphire crystals are heat-treated to remove internal stresses, enhancing their strength. They are made with two layers of anti-reflective coating. Interestingly, sapphire crystal is now also used in the latest iPhone models. While sapphire crystal is more expensive, it is typically found in higher-end watches due to its superior qualities.

Shipping Notes
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  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 56516486341

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September Hall
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★★★★★ 5
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Size: Small, Color: (725) Oxford Brown / Oxford Brown / Black
Very comfortable and perfect fit for my small feet. I love the full coverage sock feel with a totally no show sock.
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Reviewed in the United States on May 29, 2026
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ABK
Phoenix, US
★★★★★ 5
Great no shows for people with larger feet
Size: Large, Color: (001) Black / Black / Castlerock
Some of my favorite socks!! Great quality, fit, and material. I love that they don't slip down in my shoes, especially considering I have larger feet. I also love that Under Armour offers larger sizes in their socks considering everyone in our household has much larger feet than others.
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Reviewed in the United States on May 3, 2026
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Tatacrio
Louisville, US
★★★★★ 5
Best liner socks EVER
Size: Medium, Color: (348) Silica Green / Silica Green / Hydro Green
I have them in every color and used to get them from Sams, but they stopped selling them and I was lucky to find them on Amazon. Got all colors again. They stay, it's all I'm gonna say! And don't show in any of my tennis shoes. Absolutely love them and wear them until they get holes. They last a LONG time too. They're on the thin side and my foot loves them because they tend to get hot. There's no shrinking, they wash great with exception of the white ones I couldn't manage to keep white - they turned a bit greyish.
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Reviewed in the United States on January 4, 2026
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Christy F
San Leandro, US
★★★★★ 5
Great socks
Size: Medium, Color: Pink - 647
Well-made and comfortable to wear. Great for golf and other outdoor activities. Like them because they do not show above shoes.
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Reviewed in the United States on April 19, 2026
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Cait E
Boise, US
★★★★★ 5
These ACTUALLY stay put all day long - I was skeptical, but am so glad I took a chance on these
Size: Medium, Color: (014) Halo Gray / Halo Gray / Castlerock
I was so skeptical about whether these would stay on my feet all day without sliding down into my shoe - I’ve tried so many socks in the past with the silicone strip on the heel which failed. I’ve owned these for a couple months now and they have never slipped down - they stay put all day! I love the variety of colors to choose from, and the value per pack is great since six pairs come per pack (I thought it was only three when I first purchased and was pleasantly surprised by the additional pairs). They also have perfect thickness - not too warm to wear during the summer months with sneakers; I live in a tropical climate, though, so I’m not sure how they will do in cooler climates. I’ve washed each pair once or twice and the color and quality of the silicone has stayed so far (knock on wood). Overall: high recommend based on my experience so far!
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