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日內瓦 Isaac Grasset & Cie，錶殼號 50，51mm， 99g， 約 1880
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。
Isaac Grasset & Cie. à Genève
, Case No. 50, 51 mm, 99 g, circa 1880A 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.
#41039
錶殼 非常好
錶盤 非常好
机蕊 非常好, 走動正常
錶盤 非常好
机蕊 非常好, 走動正常