Perpetual Calendar Sapphire Limited Edition of 50, 45 mm polished sapphire crystal case, polished sapphire crystal bezel with 6 H-shaped titanium screws, sapphire crystal with anti-reflective treatment, sapphire dial, HUB 1270 Unico Manufacture self-winding movement with chronograph and calendar, approximately 72 hours of power reserve, transparent structured lined rubber strap, titanium deployant buckle. Water resistant to 100 meters.