Accompanied by Patek Philippe Extract from the Archives confirming production of the present watch in 1943 and its subsequent sale on 16 March 1943. It has never been offered in public before.
This watch bears a reference number, 530, which is usually reserved for the renowned oversized chronograph wristwatch. However, research resulted in the discovery of the fact that reference 530 was used not just for the chronograph but also for a plain model without any complication. This information is confirmed in a letter by Patek Philippe dated 3 December 2003.
Whereas the present watch very much resembles a traditional reference 570, close examination shows differences in case proportions such as a larger diameter of 36.5 mm.