Appearance: 18K yellow gold Back cover: See-through case back Glass material: Box-shaped sapphire crystal Glass coating: Anti-reflective coating on inner surface Case dimensions: Diameter 38.0mm, lug-to-lug 44.7mm, thickness 12.9mm Band width: 20mm Band material: Genuine leather (crocodile) Movement Caliber: 9S85 (Instruction manual) Movement type: Automatic mechanical (manual winding available) Power reserve: Approximately 55 hours (when fully wound) Mean daily rate: Average daily rate of +5 to -3 seconds (when stationary) The average daily rate is measured over 12 days before assembly in the case, in six positions under controlled conditions. Actual wearing accuracy: Average daily rate of -1 to +8 seconds Functions Water resistance: Enhanced daily-use waterproofing (10 bar) Magnetic resistance: 4,800 A/m Other / Features: Screw-down crown 18K yellow gold buckle Number of jewels: 37