French multi-coloured gold verge pocket watch Circa 1790

Gold pocket watch with open face by Datalle
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A beautifully French keywind four-colour verge pocket watch, circa 1790.
Extremely crafted, 18K four coloured gold case, yellow gold, red gold, white gold and green gold, opening button set with an oriental pearl, French gold hallmarks, and case number 1850. Signed enamel dial with Roman radial hours, outer minutes track, and gold-plated Louis XV-style hands. Gold-plated spindle mechanism, verge escapement.
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Diameter: 42 mm
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Weight: 50 g
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Signed: Datalle a Paris