BrandUlysse NardinModelBlast HourstrikerReference6215-400/02 (Alligator) 6215-400-3B/02 (Velvet) 6215-400-3A/02 (Rubber)Case MaterialRose gold 5N Black DLC titaniumCase Dimensions45 mmCrystalGlassbox Sapphire glassCase Back18K goldMovementUN-621 Manufacture Caliber Automatic tourbillon Automatic Flying Tourbillon for the movement /Manual-winding for the chimingWater Resistance30mStrapVelvet, rubber, alligatorFunctionsFlying tourbillon, hours, minutes Skeleton movement Hour striker (hours and half hours on demand) Devialet sound amplification system 330 components / 23 jewels 4 Hz / 28,800 V/H