A historically important model, reference 1518 was the first perpetual calendar chronograph wristwatch ever produced in series when it was introduced in 1941. According to research, only 281 examples were manufactured until the reference ceased production in 1954. It paved the way for successors references 2499, 3970, 5970 and finally, 5270, which features an in-house movement.

Preserved in excellent and remarkable condition, the present timepiece wonderfully exemplifies the characteristics of the reference 1518. An early first series example, this dial is most notably stamped with a long signature displaying "Patek, Philippe & Co". The dial is preserved in impressive condition as it has gracefully aged over time. Reference 1518 dials are notorious for tarnishing heavily due to the model's snap-on bezel and caseback, which allowed moisture to seep through. However, this particular dial has aged to a warm ivory tone and has incredible charisma. The enamel signature remains thick and defined, with the accent above the "e" in "Genève" strong and present, as is the comma between "Patek" and "Philippe". The hard enamel graphics on the dial remain preserved and raised wonderfully.

Boasting two hallmarks, the case retains its original proportions. While one hallmark is stamped under the lug, the other is punched on the side of the case. Furthermore, this timepiece retains its non-signed crown, which is correct.

This timepiece has been in an important private European collection since 1995 when it first appeared on the auction market.

It is a remarkable occasion when a reference 1518 appears on the market, no less in such original and excellent condition.