Swiss silver, enamel and stone set sundial watch Circa 1780

Silver sundial watch with compass
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A very rare sundial pocket watch with compass, probably made in Switzerland by Rousseau, circa 1780. The open faced case, crafted from silver, has a blue enamelled reverse with painted gold stars and both bezels are set with stones (one stone missing). The glazed face shows a central white enamel sundial, surrounded by stone setting, and a compass underneath.
Dial signed.
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Diameter: 44 mm
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Weight:  gr.
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Signed: Rousseau Inv. Fec.
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Rousseau
Rousseau invented this type of sundial pocket watch with a compass. Almost all known examples have plain metal cases. The present piece, with an enamelled case and stone setting, is an extremely rare version.