First introduced to the market in 1954, the Patek Philippe reference 2551 is the second reference to house the famous self-winding caliber 12-600. With a two-piece screw back stepped case made by the impressive A. Wenger, it is without a doubt attractive and further enhanced by its exquisite stepped lugs. The delicate silvered opaline dial with applied gold indexes matching its respective case, it is to no surprise that it was manufactured by one of the most discerned dial makers, Stern Frères with three versions known in total. Produced in yellow gold, pink gold, white gold and platinum, it is estimated that only 1372 examples were ever manufactured across all case materials, with majority encased in yellow gold. With an estimated 230 examples housed in pink gold, less than 25 pieces has surfaced on the market. Both white gold and platinum examples are produced significantly less than the other two respective metals.