Swiss gold, enamel and pearl set cylinder watch Circa 1806

Very fine pair cased pocket watch
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A very fine and thin Swiss gold, enamel and pearl set pair cased cylinder pocket watch, circa 1806.
Full plate movement, key-wound, cylinder escapement with brass cylinder wheel.
White enamel dial with Roman hours and Arabic quarters. Gilt protective case, glazed on one side, an outer case with a very fine polychrome enamel painting of a Mediterranean harbour scene to the back, set with pearls, and an 18-carat gold inner case with punch mark DB.
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Diameter: 55 mm
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Weight: 90 g
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Signed: No Name
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Literature: ‘Email-Uhren. Kostbarkeiten unter den Taschenuhren’ by Alfred Leiter und dr. Alma Helfrich-Dörner, Kornwestheim 1977.