Austrian rock crystal star shaped form watch Circa 1752-1823

Silver open faced verge watch by François Louis Chavanne
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An Austrian very rare Vienna rock crystal star shaped form watch, circa 1752-1823. Verge movement.
Silver case in the shape of a star, rock crystal on both sides and a multi coloured enamel rim. Multi coloured enamel dial with Roman numerals and Breguet hands.
Movement signed and numbered.
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Diameter: 56 mm
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Weight: 81 g
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Signed: François Louis Chavanne Geneva & Vienna
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François Louis Chavanne was a well-known Geneva watchmaker.
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Vienna rock crystal form watches are very popular and rare collector’s watches, especially the star shape is one of the rarest versions.