Andre Zibach Born on 30 April 1904 in La Chaux-de-Fonds, he obtained the following diplomas and certificates at the Geneva Watchmaking School: - "Echappementier" on 8 July 1920 "Repassct" on 30 June 1921 - "I lorloger-Regleur" on 30 June 1921 "Regleur" on 30 June 1922 During many years, he worked for Patek Philippe as "Regleur" and became a very skillful cratstsman in this field. Between 1950 and 1952, Andre Zibach and Eric Jaccard constructed a tonneau-shaped wristwatch movement with lever escapement, calibre 34 S, which successfully took part in the Geneva Observatory chronometer timing competitions. In 1956, Andre Zibach was appointed by Patek Philippe as Technical Vice- Manager, with, among others, the following major responsabilities: - IIead of the Research and New Studies Laboratory - Head of the Chronometer Department - Studies of Methods allowing to reach an always more accurate production. For many years, Andre Zibach has proved his ability in this field and he was greatly devoted to Patek Philippe. During this period, he contributed to the improvement and to the invention of the "Gyromax balance, for which he has been especially congratulated and received a financial allowance. IIe also took part in the realization of many other technical devices for the firm. He separated from Patek Philippe in 1960, and remains, for all specialists and connoissuers, one of the most important Precision Tinier this century.