The strap may differ from the photo!! It is now supplied with a stainless steel bracelet. Model 2431/13027A The movement is a mechanical "Vostok 2431". The number of jewels is 32. Self-winding with a safety device against over-winding of the spring. The central second hand. An instant calendar. 24-hour scale. Shockproof device of the balance node. Case: stainless steel (case ring, time dial, crown, watch back cover). The hour markers and hands are filled with fluorescent paint of variable action. All-metal stainless steel bracelet, 20 mm wide. Organic glass. Water protection: 20 atmospheres (200 meters). The energy reserve of one spring plant is at least 31 hours. Average daily running time: -20... +60 seconds per day. The average service life of the mechanism is 10 years. Weight: 89 g. Dimensions: 43.8 x 49.3 x 15 mm.