Patek Philippe confirm production of this watch with radium accents to the indexes in 1956 and its subsequent sale on February 28th, 1958.
Production of reference 2526 was launched in 1953. It is thought that only 580 examples were made, the majority of which are in yellow gold. Examples with radium accents are extremely rare.
Other examples of this model are illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, 2nd edition, pp. 213, 216-217.