Patek Philippe 5940J-001 (New with imperfections) — USD 42,985 on eBay

The Patek Philippe reference 5940J-001 is a perpetual calendar model distinguished by its cushion-shaped case, a design element that sets it apart from many of the brand's more traditional round-cased perpetual calendars. Introduced at Baselworld in 2012, this reference was the initial yellow gold variant within the 5940 series, which later expanded to include white gold and rose gold iterations. This timepiece features a yellow gold case measuring 37 x 44.6 x 8.48 mm. It is powered by the ultra-thin self-winding caliber 240 Q, a movement known for its perpetual calendar mechanism and integrated micro-rotor. The watch is fitted with a sapphire crystal, allowing for a clear view of the dial and offering scratch resistance. For collectors, the 5940J-001 represents a specific aesthetic within Patek Philippe's perpetual calendar offerings, appealing to those who appreciate a less common case silhouette combined with a highly regarded complication. Its introduction in yellow gold established the series, with subsequent metal variants broadening its appeal to different collector preferences.