Vintage Soviet Era military diver watch. Factory: Tschistopolsky Watch Factory (Vostok or Wostok, also BOCTOK). Date: 1970s. Caliber: 2209 (18 jewels). Case diameter: 38.5 mm. From lug to lug: 53 mm. Dial diameter: 28 mm. Swing lugs case. Caseback marked Amphibian 20 ATM. Genuine leather zulu strap 18 mm. Condition of the case/glass/dial: Very good! Condition of the Movement: Very good! Real piece of Soviet History.