Rare English triple-cased watch for the Ottoman market Circa 1810

Gold and enamel verge watch in triple cases by Edward Prior
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A fine, rare and small English 18K gold and enamel triple-cased verge pocket watch made for the Islamic market, circa 1810.
Three cases: an outer case with a fine enamel painted seaside landscape, a castle to the left and a vessel in the foreground, a scalloped middle case with champlevé enamel decorated bezels, a glazed, scalloped inner case, the bezels also with champlevé enamel decoration, a diamond-set thumbpiece. White enamel dial with Turkish numerals and poker & beetle hands. Full plate movement, chain and fusee, a three-arm steel balance. Dial and movement signed.
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Diameter: 50 mm
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Signed: Edward Prior London
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Edward Prior was a London watchmaker of high repute, specializing in watches for Turkey and the Ottoman Empire. He was born in 1800 and died in 1868. His father was the English watchmaker John Prior (or Josephus Pryor) who was based in Nessfield, England. Edward ran a watch workshop in London with his brother George. The company/watch brand Edward Prior continued after Prior’s death. Around 1900, the Swiss watch company Constant Piguet supplied a pocket watch with a Westminster chime to Edward Prior for the Ottoman market.