This model, reference 1518, was produced in four different series between 1941 and 1954. Only 281 examples in total were made, the majority of which were cased in yellow gold. The first series were produced with applied gold Arabic numerals. The second series, introduced at the Basel Fair, were designed with enamelled hour indexes and the 12 as an applied gold Arabic numeral. The third series had applied gold indexes and the 12 as an applied gold Arabic numeral, while the fourth series had only applied gold indexes.
The present lot is from the 1st series and is believed to be one of approximately five examples produced in pink gold with the extraordinary pink dial.
Patek Philippe confirm production of this watch in 1948 and its susbsequent sale on 19 April 1950.
A similar watch is illustrated in Patek Philippe Wristwatches by Martin Huber and Alan Banbery, 2nd Edition, p. 303.