Swiss silver double dialled cylinder watch Circa 1890

Mystery watch by Armand Schwob & Frère
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A Swiss silver double dialled mystery pocket watch, circa 1890. Crescent-shaped movement, a cylinder escapement and ring balance. Both dials with Roman hours, outer minute divisions and rotating glass discs with applied spade hands. The textured case is glazed on both sides, plain bezels and band.
Case signed and numbered, movement numbered, case and movement with matching numbers.
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Diameter: 54 mm
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Weight: 91 g
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Signed: A.S. & F. Mystérieuse Breveté S.G.D.G.
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Armand Schwob & Frère (A.S. & F.), La Chaux-de-Fonds, Switzerland, watch manufacturers. Holders of two Swiss Patents, No 2445 and 2526, in 1881, and English Patent No 9865 granted in July 1888: Transparent Watches.