Swiss gold plated keyless winding pocket watch Circa 1920

Gold open faced lever
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A Swiss gold plated open faced keyless winding pocket watch made by M.G.B.M. Dérobert Frères, Geneva, circa 1920. An engine turned case back with, in the lower center, a cartouche. White enamel dial with bold Roman hour numerals, outer minute track, subsidiary seconds at 6 and blued steel spade hands. And a red Arabic five minute track in the center. Movement with a lever escapement. Signature on the case.

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Diameter: 46 mm
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Weight: 61 g
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Signed: M.G.B.M. Dérobert Frères, Geneva
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Accompanied by a contemporary box signed H. Marti, Thun.