Heavy English gold quarter repeating chronometer Circa 1830

Heavy gold chronometer by Santiago James Moore French
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A rare and heavy English 18 carat gold open faced quarter repeating pocket chronometer, Hallmarked London 1830. Gilt full plate high quality movement with a detachable foliate engraved foot plate and engraved balance cock, cylindrical pillars, Earnshaw type spring footed detent chronometer escapement with brass escape wheel,  free-sprung two armed cut bimetallic compensation balance with wedge-shaped brass weights and meantime adjustment screws, blued steel helical balance spring with terminal curves, diamond endstone. Gold-hinged cuvette.
Engine-turned gold dial with Roman numerals, outer minute divisions, subsidiary seconds at six o’clock and original blued steel Serpine hands. Plain case with a reeded band. Cuvette and movement signed.
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Diameter: 56 mm
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Weight: 175 g
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Thickness: 25 mm
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Signed: French Royal Exchange London
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Santiago James Moore French is recorded as working at Royal Exchange and Sweetings Alley, London, circa 1810-1844. Chronometers. Sometimes just James Moore French.
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Reference 0045000