MWC 21 Jewel 300m Automatic Military Divers Watch with Sapphire Crystal and Ceramic Bezel on a NATO Webbing Strap 100ATM while many comparable watches use

while many comparable watches use perspex or plexiglass crystals

Lug to Lug: 55mm

Helium molecules can penetrate the seals under high pressure

as well as for various covert operations

Tom Smith's Adventure Film

MWC 21 Jewel 300m Automatic Military Divers Watch with Sapphire Crystal and Ceramic Bezel on a NATO Webbing Strap 100ATM while many comparable watches useProduct Code: SUB SS B A MY This watch is one of MWC's current military specification diver's watches, featuring a robust stainless steel case, an anti reflective sapphire crystal, and a scratch resistant ceramic bezel. The watch is powered by an automatic (self winding) 21 jewel Cal. 8215 movement with a 40 hour power reserve, representing exceptional value for such a high specification timepiece. Key Features: Movement: 21 Jewel Cal. 8215 with a 40