Vostok Amphibian Automatic Mens Wristwatch Self-Winding Military Diver Amphibia Case Wrist Watch #090831 Captain of Submarine Watch of official supplier of the Defense Department of the Soviet Union 200 m (20 Bar) Water Resistant Dimensions: approx. 41 x 48 x 11 mm. Nylon 5 Rings Strap Automatic VOSTOK self-winding movement with 31 ruby jewels (no hands winding required, but watch can still be wound up with winding stem if it has not worn been worn for some time) Fully wound watches run at least 31 hours. Anti-shock (shock resistant) balance, Central second hand, Graduated rotated bezel Luminous hands and dots