IWC Portuguese Perpetual Calendar Watch. 42mm 18K red gold case, sapphire-glass back, silver-colored dial, pellaton automatic winding calibre 51613 movement with power reserve display, perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase, small hacking seconds, Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms, Breguet spring, rotor with 18-carat yellow gold medallion, approximately 7 days of power reserve, dark brown alligator leather strap. Water resistant to 3 bar ,ref#IW502306
