The Patek Philippe Sky Moon Tourbillon is a masterpiece with a manually wound Caliber R TO 27 QR SID LU CL movement. This double-faced wristwatch features a minute repeater with cathedral gongs and a tourbillon. The front displays a perpetual calendar with a retrograde date hand, mean solar time, and moon phases. The reverse side offers a sky chart, sidereal time, and moon phases and orbit. Its Grand Feu champlevé and cloisonné brown enamel dial with gold Roman numerals is set in a hand-engraved rose gold case, measuring 44 mm in diameter and 17.35 mm in height. The watch is completed with a chestnut patinated alligator leather strap and a hand-engraved fold-over clasp.