French silver repeating Sonnerie clock watch Circa 1820

Self striking open faced pocket watch by  B-L Petit
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A very fine quarter repeating and self striking French clock watch with “Grande” and “Petite Sonnerie”, circa 1820.
Engine turned silver case with gold hinge, high-grade 7-part edition, numbered and signed gold cuvette, casemaker’s punch ‘LS’, slider for muting device and slider for selection ‘Quarts simples’ oder ‘Sonnerie des Heures et Quarts’. Exquisite movement quality with stone cylinder, repeating hours and quarters and self-striking quarters ‘Grande’ und ‘Petite Sonnerie’. Signed white enamel dial with Roman numerals and finest Breguet steel hands.
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Diameter: 65 mm
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Weight: 225 g
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Signed: B-L Petit Rue St. Honoré no. 340 à Paris
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The watch is a masterpiece of French watchmaking from the first half of the 19th century. B-L Petit worked self-employed on rue St. Honoré no. 340 in ca. 1810-1840 and, considering the present watch, may have been one of the best French precision watchmakers of its time. He was the son-in-law and successor (and with certainty the student) of another famous Parisian watchmaker, Claude Mathieu le Ainé, who made his masterpiece in 1754 and opened a workshop in the Rue des Capucines on Place Vendome in 1757.