French 18 carat yellow gold verge pocket watch Circa 1800

Gold open faced pocket watch 
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A fine and rare French, 18 carat yellow gold open faced pocket watch with special calibre, circa 1800. A solid, plain case by Tavernier, polished with a reeded band. White enamel dial with Breguet Arabic numerals and blued steel skeletonised Breguet hands. Gilt brass movement, unusual bar calibre with fusee and chain, verge escapement, plain brass three arm balance, blued steel flat balance spring with regulator.
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Diameter: 52 mm
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Thickness: 15 mm
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Signed: Tavernier  Paris
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Jean-Pierre Tavernier, a Parisian watchmaker from France, was born in 1714. He worked in Paris at the rue de Bussy parish of Saint-Sulpice and became a master in 1746. In 1754, he published tables with the equation of time “Table de différence du temps vrai au temps moyen”. Tavernier was known for his expertise in crafting small portable clocks, including decorative clocks in rings and bracelets. It is believed that he presented a marine clock to the Académie des Sciences around 1766, around the same time as Pierre Le Roy and Jean Romilly. In 1795, Jean-Pierre Tavernier passed away. His sons, Louis, Etienne, and Pierre Benjamin, also pursued careers as watchmakers and casemakers in Paris.