French watch with extremely rare music movement Circa 1815

Gold open faced pocket watch from Geneva/Paris
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A French technical rare pocket watch with extremely rare music movement, so-called Barillet type with musical cylinder, circa 1815.
18 carat pink gold case with small release button, Parisian gold punch 1809-1819 and maker’s punch BC; extremely rare music movement with musical cylinder, so-called Barillet type and cylinder escapement; white enamel dial with Arabic numerals and pink gold hands.
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Diameter: 55 mm
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Weight: 112 g
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Signed: No name
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Comparable watches were sold for 10,000-30,000 €.