With Patek Philippe Extract from the Archives confirming production of the present watch with silvered dial and raised gold indexes in 1946 and its subsequent sale on 21 March 1947.
Reference 1526, certainly Patek Philippe's most elegant and timeless simple perpetual calendar wristwatch, was launched in 1941. Highly appreciated by collectors, the model is immediately identifiable by its Calatrava-style case.
The present watch is from the second generation of reference 1526, distinguished by the design of the subsidiary seconds indication surrounding the moon phases: it features small hard enamel baton scales as opposed to the Arabic numerals of its predecessor and is "open" towards the moon side whereas the earlier series featured a so-called double "chemin de fer" or "railway" circle.
Reference 1526 is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, second edition, pp. 282 & 283.