Reference 3940 is the quintessential perpetual calendar and undeniably amongst Patek Philippe's greatest classics. Launched in 1984 as replacement for reference 3450, it was at the time the slimmest automatic perpetual calendar wristwatch.

The reference 3940 is one of the most iconic perpetual calendars produced by Patek Philippe and is considered to be one of the brand’s greatest classics. Upon it initial release in 1985, the 3940 became the slimmest automatic perpetual calendar wristwatch to ever be produced by Patek Philippe.

Released in 4 different series across its production run, the present lot is a fourth series Reference 3940, differentiated from its previous counterparts with updated text font and new locations of the “sigma Swiss sigma” at the 6’o clock portion of the dial.