English silver quadruple cased key wound watch Circa 1850

Silver watch made for the Ottoman market by Edward Prior
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A museum quality English quadruple cased key wound gentlemen’s pocket watch made for the Ottoman market, circa 1840-1860. The movement with a verge escapement. The white enamel dial with Ottoman numerals and blued hands.  A silver, partly gilded protective case, the first outer case plain silver and the second outer case has tortoiseshell inlays decorated with studs. Dial signed, movement numbered. Comes with the original key.
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Diameter: 44 mm
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Diameter outer case: 75 mm
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Weight: 272 g
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Signed: Edward Prior London