Swiss watch with hands moved by rotating glass discs Circa 1885

Open faced “Mystérieuse” pocket watch with certificate SGDG
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A rare Swiss silver gentleman’s pocket watch with hands moved by rotating glass discs, circa 1885.
Silver case; glazed on both sides, florally engraved and crown decorated with a red ornamental stone. The dial has rotating glass discs with applied Breguet hands and Arabic numerals. Crescent shaped movement, frosted, gilt, with cylinder escapement and ring balance.
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Diameter: 54 mm
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Weight: 95 g
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Signed: A.S. & F. “Mystérieuse”, Breveté 22.VI.88 S.G.D.G
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Certificate SGDG
Abbreviation for “Breveté Sans Garantie Du Gouvernement”
Breveté Sans Garantie Du Gouvernement is a patent or utility model protection. Literally translated: patent with no government guarantee.
In 1844, a law was passed in France whereby patents could be issued without prior examination, at the risk and risk of the applicant and without guarantee of function, novelty and merit of the invention, even with regard to precision or accuracy of the description. This legal opinion remained valid in its country of origin, France, until 1968.
Other countries stuck to such a system of registration for many years after a simple formal examination. This should exclude liability claims of any kind