German gold, enamel pocket watch with half pearls Circa 1806

Open faced pocket watch by André Hessen
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A French thin gold enamel pocket watch studded with half pearls, circa 1806.
The back lid with a very fine polychrome enamel painting of a Mediterranean harbour scene.
The protective case is gilt and glazed on one side, the inner case is 18 carat gold and it has a pendant with punch mark “DB”. The dial is white enamel with Roman numerals and decorative hands. It has a full plate movement with keywind, a cylinder escapement and with brass cylinder wheel.
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Diameter: 55 mm
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Weight: 90 g
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Signed:  André Hessen, Paris
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This watch is described and illustrated in “Email-Uhren. Kostbarkeiten unter den Taschenuhren” by Alfred Leiter und Dr. Alma Helfrich-Dörner, Kornwestheim 1977,