By 1900, the Palmer specimen was a pocket watch with minute repeater, months, days of the week, split-second chronograph, grande and petite sonnerie and the phases of the moon.
James Ward Packard, the car industrialist, was one of the most demanding customers of Patek Philippe. In 1916, he obtained a pocket watch with sixteen complications, and in 1927 he had a celestial chart added to nine other complications in a single watch.
When Packard died in 1928, the New York banker Henry Graves Jr. had already ordered the world's most complicated pocket watch, with 24 complications divided into two dials including the night time sky from New York City.
Completed in 1932, the Supercomplication is a unique piece for which Patek Philippe had mobilized their best specialists. The assembly of its 920 components in a case 74 mm in diameter and 36 mm thick is a technical feat that will remain unmatched until the era of computer-aided design.
The Supercomplication was delivered to Graves on 19 January 1933 for CHF 60K, nearly five times the price of the ultimate Packard watch. It was sold for $ 11M including premium by Sotheby's on December 2, 1999. It is for sale by Sotheby's in Geneva on November 11, lot 345.
I invite you to play the video shared by Sotheby's: