YS Roger Dubuis King Series RDDBEX0393 Movement model: RD505SQ Movement type: Tourbillon manual mechanical vibration frequency: 28800 oscillations per hour Table diameter: 42 mm Dial: Skeleton Strap: Genuine alligator leather Buckle: Folding buckle waterproof : 30 meters mirror material: sapphire crystal glass function: tourbillon fully hollow, men's true flywheel mechanical watch,,