Patek Philippe Grand Complications Chronograph Perpetual Calendar - Platinum - Golden Opaline Dial - 5270P-00141 mm platinum case, 12. 4 mm thick, interchangeable full back and sapphire crystal back, golden opaline dial with blackened gold applied numerals, caliber CH 29 535 PS Q manually wound movement with day, month, leap year and day night display in apertures, date by hand, seconds subdial, tachymeter scale, approximately 55 65 hours of power reserve, shiny chocolate brown alligator strap with square scales, fold over buckle. Water resistant to 30 m.