Released in the mid-80s when perpetual calendar timepieces were rare, the Patek Philippe ref. 3940 would quickly become the blueprint for perpetual calendar watches following in its footsteps looking to emulate its aesthetic design and, or, success. With its distinctively classical 36mm case diameter, the ref. 3940 appeals to the pre-modern days when 36mm was seen as a large watch, and technical innovations weren’t as intricate as they are today. One of the most important timepieces within Patek’s modern history, the ref. 3940’s inoffensive construction, beautiful dial, and immaculate craftsmanship all combine to create a watch that collectors still clamor to own. But with that aside, its position as the first serially produced perpetual calendar timepiece signifies that it was the watch to begin the trend for the hyper-complex that we are still; experiencing to this day. Released at the height of the Quartz Crisis, the ref. 3940 even contributed to growing the gap between traditional Swiss artisanal craftsmanship and cheap machine-made quartz watches, ultimately one of the industry’s saving graces as it helped reestablish the Swiss' reputation as the original occupants within the industry.

One of the most important watches in Patek's history, the ref. 3940 contributed to the decline in demand for quartz-powered watches as collectors, and the public, began to cherish the artistry within traditional watchmaking and all of its various crafts.