English pocket watch for Ottoman market with three cases Circa 1839

Large silver pocket watch with London Hallmarks
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A large silver pocket watch with three cases, made for the Ottoman market by Edward Prior in London, Great Britain, circa 1839. It has a heavily curved protective case, decorated with a D star on both sides, the 2^nd case covered with tortoiseshell and the 3^rd case also silver and smooth with London Hallmarks 1839, an enamel dial with Ottoman numerals and a magnificent fire-gilded verge movement with the typical Edward Prior cock with the initials EP.

Dial and movement signed.
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Diameter: 60 mm
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Weight: 160 g
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Signed: Edward Prior, London