Austrian rare gold enamel cello shape form fob watch Circa 1810

Watch in the form of a cello with verge escapement by Fs. Mayer
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A rare, small Viennese gold enamel cello shape fob watch with verge escapement, circa 1810.
Gold enamel, engine-turned and translucent red enamelled case, with engraved and enamelled sheets of music and foliate tendril -decorated on the back side- and case maker punch mark JW. Enamel dial with Arabic numerals and blued hands. The full plate movement is frosted, gilt and signed with chain/fusee, keywind, verge escapement, three-arm brass balance, and pierced and engraved balance bridge.
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Diameter: 29 x 70 mm
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Weight: 30 g
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Signed: Fs. Mayer à la Ville de Karlsbaad / à Vienna