A very fine and extremely rare stainless steel manual-winding wristwatch ref.2508.
With Patek Philippe Extract from the Arcives confirming production of this watch in 1955 and its subsequent sale on May 28th, 1956.
Ref.2508 was available in yellow and pink gold, and also in steel, such as the present watch. The steel version of reference 2508 is extremely rare. It is calculated that less than 10 percent of the total production was fitted into a steel case, and until today only less than 20 examples were publicly known.