The 5016 was Patek’s most complicated wristwatch until the release of ref. 5002, the Sky Moon Tourbillon. The watch features many complicated functions including perpetual calendar, minute repeater, Tourbillon and retrograde date and moon phase. The movement is the manual winding Caliber RTO 27 PS QR which has 28 jewels, self-compensating free-sprung balance, adjusted to temperature, isochronism and five positions. The one minute tourbillon is visible through the display back and resides in a polished steel cage. The repeater mechanism is also visible through the display back. The moonphase is accurate to one day in 122 years. The minute repeater tone is extremely clear. Case in Platinum at 37mm