Accompanied by an Extract from the Patek Philippe Archives confirming the date of manufacture as 1956 and its subsequent sale on May 21st of the following year. To the best of our knowledge, the present watch has never been offered before at auction.
The reference 2526, introduced in 1953, was Patek Philippe's first model featuring a self-winding movement, the legendary calibre 12-600 AT. With its attractive combination of a state of the art movement and traditional enamel dial, it is considered a very desirable collectors' watch.
For a similar example see Huber & Banbery, Patek Philippe Wristwatches, Volume 2, Second Edition p. 217.