With this exceptional timepiece, Hublot marks the 10th anniversary of the legendary Big Bang model by introducing one of the most esteemed complication in watchmaking - the perpetual calendar - for the very first time. The automatic HUB 1270 UNICO caliber with a 72-hour power reserve is nested inside a 45mm titanium case attached to a structured, ribbed black rubber strap and water resistant to 30m.Technical detailsReferences406. NM.0170.RX – Big Bang Chrono Perpetual Calendar Titanium Ceramic406. OM.0180.RX – Big Bang Chrono Perpetual Calendar King Gold CeramicCase45 mm diameter in Titanium or 18K King Gold (both satin-finished and polished)Bezel: Satin-finished, polished black ceramic, 6 H-shaped titanium-treated screws, countersunk, polished and lockedCrystal: Sapphire with interior/exterior anti-reflective coatingBezel lugs: Black compositeLateral inserts: Black compositeCrown: Titanium or 18K King Gold with black over moulded rubber Hublot logoPush-button: Titanium or 18K King GoldCorrectors: 2 o'clock: moon phase correction; 4 o'clock: day correction8 o'clock: date correction; 10 o'clock: month correctionCase-back: Sapphire crystal with interior/exterior anti-reflective treatment, Satin-finished titanium or 18K King Gold, satin-finishedWater resistance: 3 ATM, i.e. approx. 30 metresDialSapphire with anti-reflective treatment on both sidesIndices are rhodium-plated with white Super Luminova™ (Titanium) or gold-plated with white Super Luminova™ (King Gold)Hands: Rhodium-plated with white Super Luminova™ (Titanium) or gold-plated with white Super Luminova™ (King Gold)MovementHUB 1270 UNICO movement developed and manufactured by Hublot; automatic chronograph and perpetual calendar (date, day, month, leap years)Oscillating weight: Black satin-finished tungstenPower reserve: Approximately 72 hoursStrapStructured, ribbed black rubberInterchangeable systemClasp: Deployant buckle in black PVD titanium with inserts in Ceramic (Titanium version) or in 18K King Gold (King Gold version)