The Calatrava 96 was first introduced in 1932 and is one of the earliest watches released by Patek Philippe. It was also the first model launched after Charles and Henri acquired the brand, aiming to infuse new vitality into the brand. The Greek letter Sigma "σ" on both sides of "swiss" at 6 o 'clock on the dial indicates that the dial scale is made of 18k gold. The case is sharp and has an exquisite quality that does not belong to this size. -PateK Philippe, Calatrava Cal.5026R, 18k gold case, 33mm