English triple cased watch for Ottoman market Circa 1792

Silver open faced pocket watch by George Prior
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A very heavy English verge pocket watch with three cases, tortoiseshell outer case and stud decoration made for the Ottoman market, circa 1792.
Three cases: transport case – silver, tortoiseshell-covered, stud decoration, large lateral hinge; outer case – silver, tiered, large lateral hinge; inner case – silver, polished, case maker’s punch mark IR (James Richards, London). Signed enamel dial with radial Ottoman numerals and minutes, and blued hands. Full plate movement, gilt, signed, florally engraved, chain/fusee, pierced movement pillars, three-arm steel balance, very finely pierced and florally engraved balance cock with vase décor, the open-work forms a GP, which are the initials of George Prior.
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Diameter: 73 mm
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Weight: 201 g
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Signed: George Prior London
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George Prior
The son of John Prior of Nessfield, also a clock-maker, was a leading London maker of watches for the Turkish and Islamic markets, in association with Edward Prior, who was perhaps his brother. On two occasions he received an award from the Society of Arts for his productions.