The MWC "Depthmaster" range Military Diver models are MWC's latest heavy-duty range and are both extremely robust with a sapphire crystal as well as being suitable for diving with mixed gases at extreme depths due to the 100atm water resistance rating, they also have a wider strap at 24mm (most military divers watches use a 20mm strap) and a non-scratch ceramic bezel which is easier to grip in extreme cold. This model also has tritium GTLS tubes for maximum nighttime and low light performance. The Depthmaster range is specifically designed for use by professional divers under challenging conditions.

All MWC 100ATM models are fitted with a helium escape valve, people often ask us how helium gets into a dive watch in the first place and the answer is very simple, essentially a helium molecule is among the smallest of all molecules. What this means is because they are so small even though the seals are working fine to keep water out the helium molecules can still get through and enter the watch even though other gases and water cannot.

The main users professionally of watches with helium escape valves are saturation divers who spend long periods of time at great depth with high pressure, the result is that the helium molecules can build up inside the watch creating pressure inside the case, this can inflict serious damage to the watch and even blow out the crystal or crown when it’s unscrewed, this is potentially extremely dangerous if for example you are just checking or resetting the time, it can also potentially write off the watch. What the helium escape valve does is automatically allow the helium molecules to escape from the watch during decompression when the watch returns to normal standard sea level pressure. The valve is only one way so it lets the helium out but prevents anything external getting in.

This particular variant has a 24-hour military format dial and is finished in black PVD stainless steel. The special covert matt black non-reflective PVD finish used for this watch is often specified in military contracts for many special forces units as well as by anti-terrorist units and for various covert operations. In the PVD process, the steel is not black all the way through because the colour is created by a special chemical PVD plating process which is vastly superior to the painted finish used on some lower quality watches which can easily fade or rub off. This PVD process means that the colour of the steel is altered at a molecular level, therefore it will not deteriorate even during heavy usage although it can be destroyed if the case is badly damaged by a piece of metal being gouged out or if the case is worn down by continuous heavy abrasion against rocks, etc.

The movement is a high quality 24 jewel automatic NH35A with hacking function to enable synchronization. The movement also has a 41-hour power reserve.

Dimensions and Specification:

Movement: 24 Jewel Automatic NH35A with hacking function
Water Resistance: 100ATM / 3,280ft / 1000M
Screwdown crown
Helium Escape Valve
Width: Inc Crown 47mm (Exc Crown 44mm)
Bezel Type: Unidirectional Non-Reflective with Ceramic Insert
Thickness: 18mm
Crystal Diameter: 31mm
Crystal Type: Sapphire with Anti Reflective Coating
Lug to Lug: 48mm
Weight: 140g
Case: 316L PVD Stainless Steel
Illumination: GTLS Tritium on markers and hands Luminova on the bezel
Strap: 24mm NATO Webbing Strap

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