With Patek Philippe Extract from the Archives confirming production of the present watch with silvered dial and gold numerals in 1944 and its subsequent sale on 8 February 1949. Furthermore delivered with Patek Philippe fitted presentation box.
The offered lot is furthermore distinguished by its early dial: this much sought after version in use until 1945 features the signature Patek Philippe & Co. and larger fonts for the day and month indications. The tachymetre scale is furthermore not framed by two thin lines as found in the later series.
Reference 1518 was launched in 1941 and according to literature, only 281 examples were made until 1954, the majority cased in yellow gold. It was furthermore the first perpetual calendar chronograph wristwatch produced in series by any watch company. The model was later replaced by reference 2499, also a perpetual calendar chronograph, but with a wider diameter and fluted lugs.
Reference 1518 is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, first edition p. 231 pl. 386, second edition p. 303 pl. 459 and in Armbanduhren - 100 Jahre Entwicklungsgeschichte by Kahlert, Mühe, Brunner, second edition p. 127.