Model 2416/280991 The mechanism is a movement "Vostok 2416B". 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: stainless steel (case ring, time dial, crown, watch back cover). The hour markers and hands are filled with fluorescent paint of variable action. Organic glass. Water protection: 20 atmospheres (200 meters). Strap: nylon (ZULU), width 20 mm. The energy reserve of one spring winding is at least 31 hours. The average service life of the movement is 10 years. Weight: 100 g . Dimensions: 43.8 x 50.5 x 15 mm.