English 18K gold watch made for the Islamic market Circa 1810

Gold and enamel verge in triple cases
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A fine English 18K gold and enamel triple-cased verge pocket watch made for the Islamic market, circa 1810. Alpine Watermill by George Prior.
The outer case with scalloped edges, a glazed back, the bezels in light green champlevé enamel with translucent red enamel flower and leaf decoration. The middle case also with scalloped edges, the back with a painted enamel Alpine scene depicting a watermill on the banks of a stream in the foreground, a translucent red border, the bezels with opaque azure champlevé enamel decorated to match the outer case. A polished inner case punched AN.
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White enamel dial with Islamic numerals, outer minute track and blued steel Breguet hands. A gilt-brass full plate movement, elaborate pierced vase pillars, fusee and chain, verge escapement, steel three-arm balance, flat balance spring, one-footed cock pierced and engraved with asymmetrical foliage, rack and pinion regulator with a silver plate with Islamic numerals. Dial and movement signed.
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Diameter: 42 mm
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Signed: George Prior London
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The former property of a Swiss collector.