MWC "Submariner / Naval Crew Divers Watch" in Covert Black PVD 500m (1,640ft) Water Resistant Dual Time Zone Military Watch in PVD Stainless Steel Case with GTLS and Helium Valve strao External Pressure Interface: 6 N

External Pressure Interface: 6 N

The updates mean that

Safe: no harm to the movement

a process historically used on many military watches but not widely employed since the 1990s

MWC "Submariner / Naval Crew Divers Watch" in Covert Black PVD 500m (1,640ft) Water Resistant Dual Time Zone Military Watch in PVD Stainless Steel Case with GTLS and Helium Valve strao External Pressure Interface: 6 NSKU: 500M SUBC PVD The MWC "Naval Crew" range of Military Divers models represents one of MWC's latest heavy duty series, available in two versions: covert non reflective PVD steel and standard stainless steel. These watches are specifically designed for demanding environments, using red T100 tritium GTLS tubes to preserve night vision on a ship's bridge or in a submarine. Submarines are typically 'rigged for red' to allow periscope use at night,