2Jewellery Automatic Watches, double-wound mechanical automatic tourbillon, artificial sapphire mirror, double-wound linkage system, 72-hour long-function reserve, high-grade split combined shell, Italian calf leather. Brand: HaofaTOURBILLON Movement: Automatic mechanical tourbillon Model: 3HD0 Vibration frequency: 28,800 times/hour) Drive: Double clockwork drive. Power storage: 72 (hours) Winding mode: automatic winding Gem bearing: 36 Diameter of case: 41mm Material: 316 fine steelThe thickness of the case: is 13.5mm Material: cowhide Width of strap: 21mm Waterproof depth: 30m waterproof for domestic use. Weight: 84g Mirror bottom cover: artificial sapphire glass cover