HAOFA GMT Flying Manual Tourbillon Sapphire Crystal Watches 1919

Product Parameters
Movement: CAL.3H31
Movement model: 1919
Drive: single-spring drive
Power reserve: 42(hours)
Vibration frequency: 28800 (times)
Winding method: Manual winding
Case Diameter: 45-30mm
Case Thickness: 11.9mm
Strap width: 26x 20mm

Case material: 316 stainless steel
Strap Material: Rubber
Waterproof depth: 50 meters life waterproof
Crystal: Artificial sapphire
Buckle: Double Butterfly Snap
Crown: straight