Patek Philippe confirm production of this watch in 1945 and subsequent sale on 10 September 1947.
Patek Philippe produced only 281 examples of this model with reference number 1518 from 1941 to 1954.
The reference number 1518 was produced in four series. This particular watch is from the first series which was made as of 1941 with applied gold Arabic numerals. The second series, with enamelled hour indexes and the 12 in applied gold Arabic numerals, was presented at the Basle Fair in 1942. The third series was made with applied gold indexes, the 12 again in applied gold Arabic numerals and the fourth series with applied gold baton indexes.
A similar watch 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, Mhe, Brunner, second edition p. 127.