Very fine French cylinder with matching chatelaine Circa 1820

Gold, enamel, diamond and pearl set chatelaine watch
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A very fine French 18 carat gold, enamel, diamond and pearl set pocket watch with chatelaine, circa 1820. Extremely rare and super thin bagnolet calibre with cylinder escapement. Screwed white enamel dial with Roman hours and outer minute divisions, steel filigree Breguet hands. Thin case with Jules Frères punch, very thin and finely reeded band, both sides set with oriental half pearls, the back with engine turned blue enamel and applied interesting gold ornaments. Movement signed. Comes with a corresponding and original 18 carat gold and enamel chatelaine, set with oriental pearls and diamonds, equipped with two signets and the original bagnolet key. Also accompanied by the original presentation box.
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Diameter: 33 mm
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Weight: 26 g
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Length chatelaine: 12 cm
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Weight chatelaine: 50 g.
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Signed: Ene Duris 7 Rue du Bouloi Paris
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Special feature: the loops of the key and signet are made in the form of enamelled snakes.
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The bagnolet caliber was invented by Genevan watchmaker Philippe Samuel Meylan (1772-1845), it allowed make the watches thinner. A bagnolet movement is one in which the balance is on the dial side of the movement. Meylan developed the bagnolet concept in 1800. It permitted a larger balance wheel to be used, increasing accuracy. The dial was affixed to the case rather than the movement with a complete plate on the rear side.