Marathon WW194003SS-0001 36mm SSGPM Standard-Issue Officer's Mechanical US Govt Markings Casio G-Shock Ana-Digital 3 Eye Military GA100L-8ACR where Seiko diver's watches became

where Seiko diver's watches became essential equipment for the Japanese Antarctic Research Expedition (JARE)

Clasp Type Double-lock clasp with push button release

Power Reserve : 80 hour

Movement Type: Automatic (21

One-push three-fold method

Marathon WW194003SS-0001 36mm SSGPM Standard-Issue Officer's Mechanical US Govt Markings Casio G-Shock Ana-Digital 3 Eye Military GA100L-8ACR where Seiko diver's watches becameCommonly known as the Officer's Field Watch Mechanical (OFM) or Stainless Steel General Purpose Mechanical (GPM SS). Marathon's Officer's Watch features a case diameter of 36mm, a thickness of 11mm, and 16mm lug width, making it perfect size for everyday wear. Comes on a Black Ballistic Nylon strap. Movement: Automatic Caliber: Sellita SW210 1 with Incabloc Shock Absorber Jewels: 18 Scale Quantity: 2 Scale Range: 112 (1324) Crystal: Sapphire Crown