French repeating watch with cylinder escapement Circa 1820

Gold open faced pocket watch by Lagrave 
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An extraordinary, 18K gold open faced pocket watch with a very rare movement and quarter-hour repeater, circa 1820.
Engine-turned 18K rose gold case, dust cover signed. Very rare calibre, repetition of the hours and quarter hours, and cylinder escapement. Enamel dial with Breguet-style radial hours, outer minutes track, and Breguet steel hands.
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Diameter: 57 mm
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Weight: 108 g
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Signed: Lagrave, a Paris
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Lagrave, Etienne; Watchmaker in Paris, Rue Dauphin, married to Marguerite Catalas, mentioned November 22, 1788, at the christening of their son Louis.