Patek Philippe first made single button chronograph wristwatches in the early 1920s. These watches all utilized the Victorin Piguet base caliber which was then finished in house. Shortly after the launch of the Ref. 130 chronograph in 1934 Patek Philippe changed to the Lemania chronograph caliber, thereby giving two distinct generations to these early chronograph wristwatches. Amongst the chronographs produced in the first half of the 20th century those with the single button on the winding crown and using the Victorin Piguet movements are the most desirable ones. The present watch is exceptional due to its use of a Victorin Piguet movement in the late 1930s, with horizontal auxiliary dials. The case design is also unusual due to the fact that it is not a Ref. 130, which was the standard at the time this watch was made. The current watch case, at over 34 mm in diameter, is unusually large for the period. This is the only example of a platinum single button chronograph wristwatch by Patek Philippe ever to have appeared on the market and is thought to be unique. Hitherto it was thought that single button chronographs were cased in stainless steel/Staybrite, yellow gold, pink gold, yellow gold with platinum accents, and white gold (three examples known). Patek Philippe single-button chronograph wristwatches are technically and esthetically remarkable, both in terms of iconography and the conception of the movement. The present watch, with its two-tone silvered dial and blued steel hands, is a particularly striking example of Patek Philippe?s production in the 1930s. The register dials, tachometer graduation and outer 1/5th second scale are arranged on the dial in a way that accentuate the two-tone effect and give the watch a bold yet understated look. This, associated with the pure lines of the case, creates an especially satisfying impression of geometrical harmony, an example of the best in Art Deco design.