Patek Philippe’s companion reference to the sporty 2508, the 2509 notably differs with its feature of subsidiary seconds versus center seconds, but they are otherwise identical: the sculptural lugs, broad, sloping bezel, screw-down caseback, and anti-magnetic dust cover on the movement.

The reference was in production from 1950 to the late 1960s, evolving over these years: early versions are fitted with lozenge and triangular indexes, such as the present example, and later versions with lapped indexes and beaded minute divisions. The caliber powering the model undergoes changes as well; while at the beginning it was cal. 12-120, it then became 12-400 (like the present example), and finally the anti-magnetic 12-AM400 at the very end of production. All cases of references 2508 and 2509 were made by Geneva-based casemaker Taubert, identified not only by the number 11 within a key, stamped inside the back, but also by its logo FB for François Borgel, similarly found inside the case back.

Produced in 1953 and fresh to the auction market, this well-preserved example was imported to the United States, as indicated by the HOX stamp on the movement and the “18K” stamped to the outer edge of the caseback.