IWC Big Pilot’s Watch Perpetual Calendar Tourbillon Edition Le Petit Prince Watch - 18K Armor Gold® Case - Blue Dial - Brown Calfskin Strap Limited Edition of 50 - IW50480346. 2 mm 18K armor gold case, 16. 0 mm thick, see through sapphire glass back, screw in crown, convex sapphire glass crystal with antireflective coating on both sides, blue dial, calibre 51950 automatic movement with date, day, month, perpetual calendar, year indicator, hours, minutes, small seconds, moonphase, tourbillon escapement, approximately 168 hours of power reserve, brown calfskin strap. Water resistant to 10 bar.