Product Details

SKU: 100AT/12/SS/QZ/ST

Model Discontinued – Sold Out

This model, available in both PVD and stainless steel, is now sold out and has been officially discontinued. It was produced for a procurement company that secured a contract requiring a watch built to very specific technical standards. As a result, it differs in several key ways from other 100 ATM watches we manufacture. The additional contract requirements are outlined below.

About the MWC “Depthmaster” Military Diver

The MWC Depthmaster is one of our most rugged and high-spec timepieces to date. Built for professional use under extreme conditions, this model is part of our heavy-duty 100ATM range. Key features include:

• Sapphire crystal for exceptional durability

• 100 ATM (1,000m/3,280ft) water resistance – suitable for mixed gas diving at extreme depths

• Ceramic bezel – highly scratch-resistant and easy to grip in cold or wet environments

• 24mm strap width – wider than the standard 20mm on most military diver’s watches

Helium Escape Valve – A Crucial Feature for Deep Dives

All watches in the 100ATM range include a helium escape valve, a feature often misunderstood. Here’s the short version: helium molecules are incredibly small—so small, in fact, they can sneak past seals that block water and other gases. Over time, helium can accumulate inside a dive watch, especially during saturation dives. When a diver decompresses, this internal pressure can blow off the crystal or unscrew the crown—potentially destroying the watch or injuring the wearer.

The helium escape valve allows helium to safely vent during decompression without letting any water in. It’s a one-way valve, and while not every diver will need it, it’s an essential safety feature in a watch designed for the most demanding environments.

Why Use Helium in Deep Diving?

Good question! Helium is used instead of nitrogen in deep-sea diving because it avoids the effects of nitrogen narcosis, which can impair a diver’s judgment. In saturation diving, professionals live in pressurized habitats filled with an oxygen/helium mix for days or weeks at a time. As they decompress, helium must be safely released—just as it must be from their watches. That’s where our valve comes in.

While most recreational divers won’t need this feature, it’s vital for professional-grade timepieces intended for such use. In short: better to have it and not need it, than need it and not have it.

Special Features of This Contract-Specific Variant

Although this watch shares its DNA with our standard 100ATM models, it was built for a military procurement contract and includes two unusual specifications:

1. Altitude tolerance – Accuracy must be maintained at up to 12,000 meters / 40,000 feet without compensatory pressurization.

2. Magnetic resistance – The watch had to withstand exposure to magnetic fields of 4,800 A/m (approx. 60 gauss).

Why these specs were required remains a mystery, but they made this watch particularly unique. The contract also called for a sterile, unbranded dial, making it even more distinct.

This version features a European NATO-style dial and a brushed stainless steel case. It uses the Swiss Ronda 715li quartz movement, which offers a 10-year battery life and hacking function for precise time-setting.

Specifications

• Movement: Swiss Ronda 715li, 10-Year Battery Life, Hacking Function

• Water Resistance: 100ATM / 1000m / 3280ft

• Crown: Screw-down

• Helium Escape Valve: Yes

• Case Diameter: 47mm (including crown), 44mm (excluding crown)

• Bezel: Unidirectional, Ceramic Insert, Non-Reflective

• Case Thickness: 18mm

• Crystal Diameter: 31mm

• Crystal Type: Sapphire with Anti-Reflective Coating

• Lug to Lug: 48mm

• Weight: 132g

• Case Material: 316L Stainless Steel

• Illumination: Luminova on hands, markers, and bezel

• Strap: 24mm NATO Webbing Strap (Includes 1x Black & 1x Grey)

Why Sapphire Crystal?

We’re often asked: What’s the big deal about sapphire crystal? The answer is simple—it’s the toughest material you can use for a watch crystal. It’s highly scratch- and shatter-resistant, which is why it's favored by military personnel, security professionals, law enforcement, and outdoor adventurers. These groups represent over 70% of our customer base.

To put it in perspective, most broken watch crystals we see are mineral glass, even the hardened kind. Sapphire is leagues ahead in toughness. It’s also heat-treated to eliminate internal stress and finished with dual-layer anti-reflective coating. It’s no wonder sapphire is now used on the latest iPhones, too.

While it’s more expensive, sapphire crystal is a hallmark of high-end, mission-ready timepieces—just like the Depthmaster.

• Delivery

  • Delivery charges are as follows:

    USA/CANADA	EUROPE	UK	REST OF THE WORLD
    Tracked Mail US$11.50	Tracked Mail €11.75 / £10.25 / US$11.50	Tracked Mail  £9.95	Tracked Mail US$11.50 / €11.75 / £10.25
    Express Courier UPS or FedEx  US$25.00	Express Courier UPS or FedEx  €27.50 / £24.00 / US$27.00	Express Courier  UPS £12.95	Express Courier UPS or FedEx  US$41.50 / €42.50 / £36.50

    You will generally receive two emails after placing an order, the first will be a confirmation of receipt of the order and payment, this will be followed by a notification of shipment  once the goods are dispatched. When an order and payment has been processed, goods will be shipped by the Post Office or Courier within 48 hours. Please note that our shipping centers are closed on Saturdays and Sundays therefore orders placed during this time may take up to 72 hours to be dispatched, this includes orders after 13:00 European time on Fridays.

    The estimated delivery times in working days are set out below: *

    • USA Registered Mail: 4 to 12 days
    • USA UPS: 2 to 3 days
    • Europe UPS: 2 to 5 days
    • Europe Registered Mail: 7 to 14 days
    • UK DPD or UPS: 12 to 48 hours
    • UK Royal Mail: 1 to 3 days
    • Rest of World UPS: 3 to 10 days
    • Rest of World Registered Mail: 7 to 21 days

    All shipping estimates exclude Saturdays and Sundays when our packing and shipping centres are closed and also some countries postal services do not operate at the weekend.
    

    * Some countries are prone to be notoriously slow to process goods on arrival, among these countries are Israel, Hong Kong, Macau, Mexico, South Africa and some South American countries. We also tend to experience significant delays with many countries in Africa in addition to South Africa, you can always contact us for advice although we do not know with certainty exactly which countries will be slow, and which will be fast but the above estimates are a pretty good guide for most countries, keen in mind remote territories or those with slow customs processing can also tend to be problematic. Regardless of the processing speed, all of our shipments are fully insured against Loss.

    Please Note: We recommend using UPS, DHL or Fedex, which we offer as an option, if the delivery is very time sensitive and you are aware that your local Postal Service he's not particularly reliable.

    Whilst we make every effort to deliver your order within the above timeframes this is a guide and delivery cannot be guaranteed. We will not accept responsibility for delays caused by our Couriers or any National postal service. If the goods are not delivered within the time we have estimated, please feel free to contact us or email admin@mwc.watch, and we will do everything possible to resolve the issue promptly. We will not be liable for any loss caused to you by late delivery.

    Our delivery charges covers the cost of shipping the goods to you. However, this does not include import charges and administration fees to clear the goods when entering your country. 

    If you need to clarify any details regarding local taxes for your location, please contact us before placing an order. For clarification, goods shipped to the EU can be dispatched from our EU location if ordered on this site, and we also have a UK shipping center if you order at www.mwcwatches.co.uk

    In the United States, orders under $800 do not incur taxes or fees. In Australia, orders up to AU$1000 are tax-free. Many other countries have similar regulations, which you can verify using this helpful link: Zonos De Minimis Values and also another link below to calculate taxes for shipments to most countries which is here https://www.simplyduty.com/import-calculator/

    It is the responsibility of the purchaser to understand that charges may apply and pay all subsequent import tax and duty on goods shipped to their respective Country. In the instance that items are returned to MWC as a result of a rejected payment, subsequent charges incurred such as Import Duty and processing costs will be deducted from any refund issued. For further information on this please contact accounts@mwc-distribution.com 

    We do not accept any liability for goods that have been lost after delivery to a PO Box. We reserve the right to cancel orders where the delivery address is a PO Box. Furthermore, we also do not accept any liability for goods that have been lost after they are confirmed as delivered to APO or BFPO locations. 

    It is the Customer's responsibility to notify us if the goods have not been received within 21 days of the estimated delivery date or time of ordering. If no notification is made within this time period the buyer shall be deemed to have received the goods.

    Failed delivery of an item ordered due to non-acceptance of the delivery

    Please note that if you order an item and the delivery company inform us that the item was refused it would be returned back to us, in many cases especially with FedEx, UPS etc they will also charge a return fee to send it back. Because in these circumstances we have done everything that is required to get the item to you we would refund less both the outbound and Inbound shipping charges once the item was received back at our packing and shipping centre. Unfortunately sometimes if you are having the order delivered to a business location the people receiving inbound parcels are prone to refuse an item without checking with the individual concerned we would strongly recommend being very cautious in this situation and notifying the people who handle the incoming parcels that you are expecting a delivery to avoid this problem occurring. Usually, we would be notified there is a delivery issue and would email you for your instructions, normally these sorts of problems can be avoided if you contact the carrier and tell them there is an error but it's very important to act quickly to avoid the return and associated costs.