Rare Swiss 18K gold double sided pocket watch Circa 1888

Gold cylinder watch by Armand Schwob & Frère
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A rare Swiss 18 carat gold double sided cylinder pocket watch, circa 1888. Crescent movement, a cylinder escapement and ring balance. An eccentric white enamel dial on the front with gold Roman hours, an outer minute track, outermost Arabic five minute numerals on a black chapter ring and a rotating glass discs with applied spade hands, a similar dial on the reverse, but without the minute numerals. The case is finely engraved with foliage and glazed on both sides, the front is inscribed Breveté 22.17.58 A.S. & F. Mysterieuse S.G.D.G. Case and movement numbered.
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Diameter: 54 mm
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Weight: 111 g
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Signed: Armand Schwob & Frère
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Armand Schwob & Frère was based in La Chaux-de-Fonds, Switzerland. In 1881, the company received two Swiss patents numbered 2445 and 2526 and an English patent number 9865 in July 1888 for transparent watches. These Schwob watches are usually found in silver cases and, occasionally, in silvered ones, only a few timepieces of this type were made in gold.