Brand: GRAND SEIKO Model Number: SBGW283 Exterior: Stainless steel Back: Stainless steel and sapphire glass Back specification: See-through back 6 screws fixed back Glass material: Box-shaped sapphire Coating: Anti-reflective coating on the inner surface Case size: 37.3mm wide, 44.3mm long, 11.7mm thick Band width: 19mm Band material: Crocodile Wrist circumference length (maximum) 195mm Movement: 9S64 Instructions Driving system: Mechanical, manual winding Driving period: Approximately 72 hours (approximately 3 days) at maximum winding Static accuracy: +5 seconds to -3 seconds average daily difference Water resistance: Water resistant for daily life Magnetic resistance: Yes Weight: 61 g Other: 24 jewels No. 69 OSK [HA0048]