The reference 3435 was introduced in 1960 as a successor to the reference 2584 (See previous lot), sharing similar aesthetics and appeal with a smaller 34mm case size. When discussing vintage Patek Philippe automatic calibers, the cal. 12-600 often comes to mind as it powers the iconic reference 2526. However, the present watch is equipped with the updated cal. 27-460, which showcases an updated Gyromax balance wheel with a Breguet hairspring and a revamped rotor ball bearing. This caliber continued to pave the way for future complications, including the first automatic date reference 3445 and even the 3448 perpetual calendar.
The present watch boasts straight lugs and a special snap-on back with a raised edge that provides additional protection against moisture. This feature has contributed to the well-preserved condition of the dial, which exhibits a clean surface and prominently raised enamel signatures. Notably, the dial of this watch bears a rare co-signature "Jost" at the small seconds register. The exact date of when this official retailer opened to the public is uncertain, but the business was founded by Bernardo Jost, a Swiss gentleman who relocated to Genoa, Italy. Although the shop has permanently closed, it remains a significant part of the city's history, particularly for collectors and the world of watchmaking.
With less than 500 examples of reference 3435 were made in total, only a handful are even equipped with a co-signature. To the best of our knowledge, the present watch is fresh-to-the-market and the only one known in yellow gold with the "Jost" signature, making it a truly exceptional timepiece to own.