French verge watch with hidden Napoleon portrait Circa 1807

Open faced silver pocket watch
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A French leton and silver open faced verge pocket watch with extremely rare hidden portrait of Napoleon, circa 1807.
Full plate fire gilt verge movement, pierced and engraved cock. White enamel dial with Arabic numerals and gold hands, minute hand probably replaced. Case with the finest hidden polychrome enamel painting, a prime quality portrait of Napoleon, decorated bezel.
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Diameter: 53 mm
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Signed: No name