Features: Stainless Steel Case. Calf Leather Strap. Made In Japan. Eco-Drive (recharged by any light source, no need to change battery). 180 Days Power Reserve. Caliber: G820. Overcharge Prevention Function. Off-White Textured Dial. Time Setting Warning. Insufficient Charge Warning Function. Sapphire Crystal. Daily Water Resistant. Case Diameter: 39mm (Excluding Crown). Case Thickness: 4.7mm (Including Crown). Lug Size: 20mm. Weight: 28g Calibre No.: G820