Ref. 534Production of this reference started in 1937.Poinçons de GenèveThe voluntary quality control of watches at the Geneva Observatory was established by a law dated November 6 1886. Conditions were laid down for the attribution and stamping of the Poinçons de Genève punch-marks designed as the coat-of-arms of Geneva. Pocket watches or wristwatches which carry the Poinçons de Genève considered as an equivalent to a Bulletin Officiel de Marche punched on a bridge and on the main plate of the movement were qualified to be officially termed "chronometers".