2Jewellery Men's Watches Brands, Complicated technology, Tiangong series, double-sided hollow design, flying tourbillon, the pinnacle of mechanical watch manufacturing technology, multi-functional hollow tourbillon, superb technology, mechanical art, elegant model, 316L stainless steel case, hollow carving, sapphire mirror, powerful luminous hands, folding buckle top layer cow leather strap, full of texture.
Movement: Flying Tourbillon
Movement Model: CAL.3H31
Drive: single-spring drive
Power Reserve: 42 (hours)
Vibration Frequency: 21600 (times/hour)
Winding Method: manual winding
Jewel Bearing: 19
Case Diameter: 42mm
Case Thickness: 13mm
Strap Width: 22mm
Case Material: 316 stainless steel
Strap Material: top layer cow leather strap
Waterproof Depth: 30m life waterproof
Mirror: artificial sapphire
Caseback: Sapphire glass
Crown: straight in