Swiss silver jumping center seconds duplex watch Circa 1800

Silver technically interesting pocket watch
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A technically very interesting and very rare Swiss silver open faced jumping center seconds pocket watch, circa 1800. The key wind full plate movement with a very rare double wheel duplex escapement. White enamel dial with Arabic hour numerals, outer minute divisions and blued moon hands. A plain case. Dial and cuvette signed.
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Diameter: 56 mm
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Weight: 119 g
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Signed: Brandt Jeanrenaud & Robert
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A very fine, technically interesting collector’s watch.
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Brandt Jeanrenaud et Robert (also known as Robert Brandt et Jeanrenaud) was an early 19th century Swiss watchmaking firm based in La Chaux-de-Fonds. The company operated from the 1800s to the 1820s/1840s and was best known for pieces made between 1810 and 1820.
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Brandt Jeanrenaud et Robert made high quality pocket watches and clocks with remarkably complex mechanisms, always distinguished by interesting or unusual features, such as visible dials or independent jumping seconds.
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The company was presumably renamed Robert Brandt & Cie, continuing family and business traditions into the later 19th century.
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Some of the company’s historical timepieces are preserved in institutions like the Musée d’Art et d’Histoire de Neuchâtel.