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Auktionen Dr. Crott 91st Auction

635 Auguste Tschanz, Ecole d’Horlogerie de Saint-Imier, Movement No. 1917, Case No. 1917, 57 mm, 151 g, circa 1917  An outstanding graduate’s work with chronometer escapement and “Three Bridge Tourbillon” - with Bulletin 1ère Classe de l’Observatoire Astronomique de Neuchâtel from June 14, 1949 Case: silver, polished, glazed movement, à goutte, gold crown, bow and hinge. Dial: enamel, radial Roman hours, auxiliary seconds, blued spade hands. Movm.: three-bridge movement, German silver, mirror polished and bevelled steel bridges, screwed gold chatons, finest mirror polished, bevelled tourbillon steel cage, spring detent escapement, large Guillaume gold screw compensation balance, blued flat balance spring with 2 terminal curves by Phillips, fine adjusting device with gear and gear segment, gold escape wheel. Auguste Tschanz (1876-1967) Tschanz worked for Longines and was responsible for the design and the production of complicated watches. In 1913 he became a professor at the watchmaking school in Saint-Imier and taught there until 1940. Described in detail and illustratred in “Das Tourbillon” by Reinhard Meis, Munich, 1986 p. 148f. Auguste Tschanz, Ecole d’Horlogerie de Saint-Imier — 卓越非凡的專 業懷錶,附時計擒縱及”Three Bridge Tourbillon”陀飛輪,在1949 年6月14日榮獲Bulletin 1ère Classe del’Observatoire Astronomique de Neuchatel的一級認證 40362  C: 2 D: 2 M: 2, 41  50.000 - 65.000 EUR 55.100 - 71.500 USD 450.000 - 585.000 HKD