French gold quarter repeating pocket watch Circa 1820

Gold open faced pocket watch by Joachim Castin
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A gold, key-winding French pocket watch with a hours and quarter hours repeater, circa 1820.
Completely engine-turned, exceptional quality 18K gold case, high-quality workmanship,  Paris gold hallmark 1819-1838. Verge escapement, repetition of the hours and quarter hours. Enamel dial with Breguet-style radial hours, outer minutes track, and blued steel Cathedral hands. Movement and case with matching numbers.
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Diameter: 49 mm
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Weight: 114 g
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Signed: Joachim Castin Paris