Swiss ultra thin Bagnolet calibre pocket watch Circa 1830

Extremely rare miniature pocket watch attributed to Dubois & Cie
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An extremely rare, ultra thin Swiss diamond set miniature gold and enamel pocket watch with Calibre Bagnolet and original box made of bone, circa 1830. 18 Carat gold, engine turned and translucent cobalt blue enamelled case with a central diamond set bouquet of flowers and reeded band. Enamel dial with radial Roman numerals and blued Breguet hands. Full plate movement, inverted calibre known as Bagnolet, key wind, gilt, lavishly florally engraved, with cylinder escapement and three arm brass balance.
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Diameter: 27 mm
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Weight: 13 g
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Signed: No name
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Bagnolet Calibre
In the Bagnolet calibre, the movement is inverted, and the train is reversed. The idea was to make a very thin watch by reducing the thickness of the bridges and the dial and eliminating the cuvette. Philippe Samuel Meylan is credited with the invention of the Bagnolet calibre.
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Du Bois & Cie.
In 1785 Philippe Du Bois and his sons founded the Du Bois &Fils 1785 watch company at the family seat in Le Locle. Du Bois had already established extensive business connections all over Europe and America as a cloth merchant, which made things much easier for the start-up watch company. During the 19th century, Du Bois & Fils opened branches in Germany, the Netherlands, Spain and the United States and business boomed. Due to its proximity to the trade fairs, the German Frankfurt branch was particularly important.