Gents Patek Phillipe 18K Yellow gold Perpetual Calendar watch, Ref# 5136/1J - 001 on bracelet with concealed folding clasp and fold over latch, sapphire and solid casebacks, case diameter 36mm. Self winding movement with perpetual calendar and moon phases, day, date, month, leap year and am/pm indicators. Silver dial with registers for day, date and month, 24Hr and leap year indicators, and phases of the moon register. Winding box, papers and pusher. Pristine condition.