Patek Philippe 1518 (1948)

From Jean Claude Biver personal collection. 18k pink gold case in 35mm. The 1518 was the first perpetual calendar chronograph wrist watch ever produced in a series (1941). Only 281 pieces were made until 1954. This watch is up for auction at at Phillips on June 27/28 2020 in Geneva. Estimate 1,200,000 – 2,400,000CHF