With Patek Philippe Extract from the Archives confirming production of the present watch in 1957 and its subsequent sale on March 11th of the following year.
Reference 2526 is the first self-winding wristwatch made by Patek Philippe, produced from 1953 until 1960. This model features the legendary caliber 12-600 AT which was granted Swiss Patent No. 289758 for "a self-winding mechanism for a wristwatch movement using the energy supplied by a rotary mass causing an eccentric part to transmit a swinging movement to an organ of the mechanism". The majority of reference 2526 were cased in yellow gold, a small series in pink gold, and an exceedingly limited number in white gold and in platinum.
Reference 2526 is illustrated in Patek Philippe by M. Huber and A. Banbery, 1998, plate 349, p. 217.