2JewelleryMechanical Watch, 3D three-dimensional wishbone, high hard ceramic rotating watch ring, forged at a high temperature of over 1400 ℃, with a technology luminous display, 316 fine steel watch case, synthetic sapphire mirror, three beads fine steel watchband, fully automatic mechanical movement, and more colors. Movement: Automatic movement Movement model: CAL.7H50 Drive: single spring drive Power storage: 80H Vibration frequency: 28800 (times/hour) Chain-up mode: automatic chain up Case diameter: 40.5mm Band width: 20mm Case material: fine steel Strap material: fine steel Waterproof depth: 50m waterproof Mirror: synthetic sapphire glass Bottom cover: synthetic sapphire glass Crown: Straight-in type