Reference 533 was launched in 1937 and kept in production until 1957. The case was made by Emile Vichet and carries a flat bezel. This gives the watch a "Calatrava" look and marks the only difference compared to its closest relative, the reference 130. Noteworthy are the low production and the distribution of case materials. There are only an estimated 300 examples out there, the vast majority in pink and yellow gold, though at least one steel watch is known and interestingly, the yellow gold version is rarer than the pink. Consigned by an important collector, the dial of this reference 533 has aged in a very even way, giving the finish more of a champagne tone.