Swiss mystery watch in a silver double sided case Circa 1890

Silver mystery watch
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A Swiss mystery watch in a silver double sided case, circa 1890. The gilt cylinder movement relegated to the crescent shaped portion of the watch between the glass dial and the pendant. Keyless with going barrel, the winding crown featuring a ratchet mechanism. Small plain three arm gilt balance with blue steel spiral hairspring, polished steel regulator. Polished steel cylinder and steel escape wheel. Glass dial with gilt Arabic numerals and minute ring, decorative engraved silver masks. The gilt hands are driven by a glass disc which has a toothed brass wheel attached to its outer edge engaging the train. The miniature motion work for the hands is set between another glass disc and the dial. There is no provision to set the hands apart from moving them manually, which is common in these watches. Plain silver case glazed back and front. Rectangular button in the band to release the sprung front cover, silver bow.
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Diameter: 54 mm
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Signed: A.S. et F. Mysterieuse Brevte S.G.D.G.
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See the Camerer Cuss Book of Antique Watches page 258 for a similar watch. The mystery of hands moving without being attached to any clockwork mechanism is similar to clocks invented by Jean-Eugène Robert-Houdin. The patent for the watch was taken out by Armand Schwob et Frères in 1888.