Swiss silver cylinder mystery pocket watch Circa 1890

Silver watch glazed on both sides
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A Swiss silver keyless mystery pocket watch, circa 1890. To the design of Schwob’s Swiss patent No. 151, published on January 24, 1889. A polished case glazed on both sides. Eccentric glass dial with silver painted radial Roman numerals and outer minute track, engine turned dial plates with a planished finish and silver spade hands. Gilt brass movement, crescent shaped, eight jewels, cylinder escapement, plain brass three arm balance, flat balance spring, index regulator.
Dial plate signed.
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Diameter: 54,5 mm
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Signed: Armand Schwob & Frère  La Chaux-de-Fonds