Truly a monumental 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.

Originally consigned at auction on behalf of a descendant of the original owner, the present watch is distinguished by its exceptional state of preservation. Boasting two strong and crisp hallmarks, the case is sharp and robust. While one hallmark is stamped under the lug, the other is punched on the side of the case. The case retains crisp edges and curved definition to the back of the lugs – a stunning feat, considering that many surviving examples have been heavily polished over years of continuous wear. In addition, the original owner fitted a Patek Philippe bracelet in the 1960s as a luxurious addition to his iconic timepiece.

The dial is preserved in equally impressive condition as it has gracefully aged over time. Reference 1518 dials are notorious for tarnishing heavily due 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. The fat, wide and sharp aperture windows at 12 o’clock are a distinguishing feature of the later generation reference 1518s, their definition and crisp edges attesting to the dial’s purity.

Having recently been serviced at Patek Philippe, without polish to the case or intervention to the dial, this iconic watch is an exciting and remarkable addition to any serious horological collection.