French silver verge with extraordinary movement Circa 1810

Silver centre seconds pocket watch by Nicolas-Constant Lemaire
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An elegant French open faced centre seconds verge pocket watch with an extraordinary movement design, circa 1810.
Plain silver case with gold rim and pendant, a reeded band. Signed white enamel dial with Arabic Empire numerals, centre seconds and spade hands. Specially designed gilt bridge movement, key wind, a barrel, florally engraved balance bridge with segment-shaped cutting for regulation, three-arm steel balance.
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Diameter: 55 mm
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Weight: 108 g
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Signed: Lemaire
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Nicolas-Constant Lemaire was born in Orchies, France, in 1757 and apprenticed in Paris in 1772. He worked in Ferney with Jaquet-Droz. Lemaire wanted to settle in Paris on the Place Dauphine. He made inquiries in Paris on behalf of the Manufacture de Besançon. Afterwards, he sought to establish a high-quality ‘manufacture d’horlogerie’ in Paris. He and Bellot made a report to the Commission d’Agriculture et des Arts, proposing to make automaton watches, singing birds, ring watches, repeating watches, and equation watches. He and Glaezner became directors of the Versailles Manufacture in 1796. At the Exhibition of year VI, Lemaire showed a clock with organ pipes and a carillon. Afterwards, he seems to have disappeared and probably died around 1832.