IWC Portugieser Perpetual Calendar Watch - 44.2 mm 5N Gold Case - Silver Dial - Dark Brown Alligator Strap - IW50330244. 2 mm 18K 5N gold case, 14. 9 mm thick, see through sapphire glass back, arched edge sapphire glass crystal with antireflective coating on both sides, silver plated dial, calibre 52610 automatic movement with date, day, month, perpetual calendar, year indicator, hours, minutes, small seconds, moonphase, power reserve indicator, approximately 168 hours of power reserve, dark brown alligator leather strap by santoni. Water resistant to 3 bar.