Patek Philippe Perpetual Calendar Retrograde 18k Rose Gold Watch 5059R. Automatic movement. Rhodium-plated, fausses cotes decoration, straight-line lever escapement, Gyromax balance adjusted to heat, cold, isochronism and 5 positions, shock absorber, self-compensating free-sprung flat balance spring. 31 Jewels. Caliber 315. 18k rose gold three-part officer-style case 36.0 mm in diameter. hinged case back over transparent crystal to view the movement, extended screwed lugs. Sapphire crystal. White dial with painted radial Roman numerals. Outer minute and 1/5 seconds track. Retrograde sector for the days of the month in the center. Apertures for the days of the week at 9, the months at 3, the leap years at 12 and the moon phases. Oxidized gold feuille hands. 18k rose gold round bezel. Black leather strap with 18K rose gold deployent type buckle.