French rose gold quarter repeating cylinder watch Circa 1820

Gold open faced quarter repeater by Köppen
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A very fine French 18 carat rose gold quarter repeating open faced cylinder pocket watch, circa 1820. Fine cylinder movement, repeating the hours and quarter hours. Cuvette inscribed: Hr. M.cien de S.M. Le Roi de Prusse Köppen à Paris Rue Nve St Augustin No 9. Engine-turned dial with Roman hours and outer minute divisions, fine rose gold Breguet hands. Engine-turned case, gold punch France 1819-1838. Case numbered, cuvette signed.
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Diameter: 50 mm
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Weight: 79 g
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Signed: Köppen à Paris Rue Nve St Augustin No 9
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Köppen, important watchmaker, Court Watchmaker of the King.
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Not many watches from Köppen are known. It is interesting that he already built watches with crown winding before 1840, although the invention of the crown winding is officially attributed to Jean Adrien Philippe in 1842.