Swiss mystery watch in a gilt double sided case Circa 1900

Silver gilt mystery watch
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A Swiss mystery watch in a silver gilt double sided case, circa 1900. The gilt cylinder movement is relegated to the crescent shaped portion of the watch between the glass dial and the pendant. Keyless with going barrel, small plain three arm gilt balance with blue steel spiral hairspring, polished steel regulator. Glass dial with gilt Roman numerals and minute markings, engraved silver gilt masks. The gilt hands are driven by a second glass disc which has a toothed wheel attached to its outer edge which engages the train. The miniature motion work for the hands is set between this glass disc and glass dial. There is no provision to set the hands apart from moving them manually, which is normal in these watches. Plain silver gilt case glazed back and front. Rectangular button in the band to release the sprung front cover, gilt crown.
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Diameter: 54 mm
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Signed: A.S. et F. Mysterieuse Breveté S.G.D.G.
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See the Camerer Cuss Book of Antique Watches page 258 for a similar watch.