Patek Philippe. An extremely rare and exceptional Patek Philippe reference 600 open face platinum watch with diamond-set hour markers, retailed by Serpico y Laino Model: Pocket Watch Retailed By Serpico Y Laino Material: platinium and diamonds Reference N°: 600 Year: 1951 Case N°: 677092 Caliber: 17-140 Movement N°: 891919 Dimensions: 43,5 mm Accessories: Extract from the archives With Patek Philippe Extract from the Archives confirming production of the present watch with diamond hour markers in 1951 and its subsequent sale on 1 June 1953.