Swiss gold and enamel open faced ladies’ watch Circa 1870

Gold and enamel ladies’ cylinder watch probably by Ernest Dubois
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A very fine Swiss 18K gold and enamel open faced Louis XV ladies’ watch, circa 1870.
Elaborately engine-turned case, the bezels and bow engraved, a polychrome enamel floral painting on the back, maker’s mark ED in a lozenge. White enamel dial with radial Roman hours, gold minute dots and half-hour markers, outer Arabic five-minute numerals and original Louis XV-style hands. Movement with cylinder escapement, eight rubies, key-winding.
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Diameter: 35 mm
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Weight: 32 g
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Signed: No name