French 18 carat gold open faced quarter repeater Circa 1830

A French gold key wind quarter repeating pocket watch by Foulon á Nantes, circa 1830. Cylinder movement, 3-arm balance, two polished hammers striking on two gongs. White enamel dial, black Roman numerals, black outer minute track and blued steel hands. 18 Carat engine turned hinged open face case, reeded band, repeat slide in the band at 2. Cuvette and movement signed.
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Diameter: 50 mm
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Signed: Foulon á Nantes