English gold enamel watch for Ottoman market Circa 1817

Gold enamel triple cased verge pocket watch
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An almost as new miniature gold enamel triple cased verge pocket watch for the Ottoman market with corresponding gold enamel watch chain and key, circa 1817.
The transport case is 18k gold, polychrome enamelled edges, glazed back, a goutte, large lateral hinge. The outer case is 18k gold, polychrome enamelled edges, on back polychrome translucid enamel medallion with a depiction of the coastal area of the Dardanelles, lateral hinge. The inner case is 18k gold, polished. Enamel dial, radial Ottoman numerals, gold hands. Full plate movement, frosted, gilt, chain/fusee, pierced movement pillars, three-arm steel balance, engraved pierced balance cock, large, set diamond endstone on balance.
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Diameter: 38 mm
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Weight: 65 g
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Signed:  Edward Prior London
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Edward prior was a famous English watchmaker, who produced high-quality pocket watches for the Turkish market.