PROPERTY FROM A PROMINENT SOUTH FLORIDA FAMILY
The influence of the Ref. 1518 can be seen in all the series-produced Patek Philippe perpetual calendar chronographs that came after it (Refs. 2499, 3970, 5970, 5270). Even though the case design changed in the references that followed, the basic dial layout remained the same. Similarly, the functions of the movement have not changed in 70 years.
The Ref. 1518 was equipped with a Valjoux calibre 13Q (13 130Q), which was first upgraded and finished to the highest standards for the time in Patek Philippe's workshop. Then, Victorin Piguet was employed to modify the under-dial work and incorporate the perpetual calendar function. It was not until 1985 that Patek Philippe replaced the Valjoux for a Lemania calibre in its perpetual calendar wristwatches. With the new Ref. 5270, the Lemania caliber was replaced with the fully in-house calibre CH-29-535 PSQ.
From 1941 to 1954, a total of 281 Ref. 1518 wristwatches were made, an incredibly small production run by today's standards, with an average of just 20 watches per year.
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