Model 2416/30601G The movement is a mechanical "Vostok 2416". The number of jewels is 31. 24 mm caliber movement with a central second hand. An instant calendar. Self-winding with a safety device against over-winding of the spring. Frequency: 19800 half-vibrations/hour. Case: brass watch case. Watch back cover: stainless steel. Coverage: titanium oxocarbonitride. Mineral glass. Water protection: 2 atmospheres (20 meters). Strap: nylon (ZULU), width 20 mm. The energy reserve of one spring plant is at least 31 hours. The average service life of the movement is 10 years. Weight: 77 Dimensions: 41.4 x 46.7 x 12.5 mm.