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Auktionen Dr. Crott 91st Auction

410 409 A.S. & F. (“Armand Schwob & Frère”), La Chaux de Fonds, “Mystérieuse”, Brevete S.G.D.G., 54 mm, 98 g, circa 1885  A gentleman’s rare and almost as new gold pocket watch with hands moved by rotating glass discs. Only a few watches of this type were produced in gold. Case: rose gold, glazed on both sides, very finely engraved with foliage and mascaron in Renaissance style. Dial: rotating glass discs with applied flower hands, Arabic numerals. Movm.: crescent-shaped movement, frosted, gilt, cylinder escapement, ring balance. A.S. & F. (“Armand Schwob & Frère”), La Chaux de Fonds, “Mystérieuse”, Brevete S.G.D.G. — 罕見,保存如新的男仕黃金懷 錶,透過旋轉玻璃的時針走動,這是極少數的黃金懷錶款式 41036  C: 2 D: 2 M: 2, 41  11.000 - 14.000 EUR 12.200 - 15.500 USD 99.000 - 126.000 HKD Isaac Grasset & Cie. à Genève, Case No. 50, 51 mm, 99 g, circa 1880  A gentleman’s, unique and almost as new pocket watch with patented crown-spring winding mechanism by Isaac Grasset. To the best of our knowledge this is the only existing watch of this type in a gold case. Case: 18k pink gold, polished, à goutte, case maker’s punch mark “AM”, glazed movement. Dial: enamel, Arabic numerals, auxiliary seconds, gold Louis XV hands. Movm.: bridge movement, crown winding via tension spring coiling up the stem, frosted, gilt, signed, “Patent 5019 14528”, screw compensation balance, counterpoised lever. The Swiss Patent 5019 and 14528 by Isaac Grasset In the early 1880’s Isaac Grasset designed an interesting alternative power source in the form of a spring coiling up the stem (Swiss patent No. 120, later improved in No. 5019). In 1897 he patented a stem winding and setting mechanism for the arrangement, as found in this watch (Swiss patent No. 14528). He also patented an interesting constant force escapement and applied it to his design. 日內瓦 Isaac Grasset & Cie — 獨一無二,保存如新的男仕懷錶, 附 Isaac Grasset專利的錶冠彈簧上弦。據我們了解,這款懷錶型號是 全世界唯一附黃金錶殼的一只。 41039  C: 2 D: 2 M: 2, 41  11.000 - 14.000 EUR 12.200 - 15.500 USD 99.000 - 126.000 HKD

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