With Patek Philippe Extract from the Archives confirming dates of manufacture and sale.
Reference 2526, introduced in 1953, was Patek Philippe's first model featuring a self-winding automatic movement, the legendary 12-600 AT. With the combination of the state of the art movement and traditional enamel dial, the model is always considered a very desirable collector's watch.
The model is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, first edition, pp. 168-169, second edition p. 213, 216-217.