Six pieces are made in the world, five sold. The last one is admired in the museum, or at the Grand Exhibition of Watches in New York till July 23, 2017.
That is Patek Philippe Grandmaster Chime Ref. 6300.
A rarity for all time, it has 20 complications, among them five chiming functions and six patented innovations.
This double-face wristwatch is created to be used on a daily basis, with one side focusing on the time and the sonnerie and the other showing the instantaneous perpetual calendar.
In 18K white gold with a shiny black alligator strap, the watch can be worn with either dial facing up, thanks to the ingenious reversing mechanism between the lugs.
The total number of the components is 1580, including 214 in the case. It has sapphire crystals on both sides, among the 108 pieces of jewels.
The Art of Watches Grand Exhibition features 10 specially-themed rooms, showcasing over 450 current, historic, and unique timepieces.
It’s open free to the public from July 13th to 23th, 2017 at Cipriani 42nd St. New York.