English triple cased verge for the Ottoman market Circa 1850

Gilt-brass and tortoiseshell verge in triple cases by Edward Prior
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A fine English gilt-brass and tortoiseshell triple cased verge pocket watch made for the Ottoman market, circa 1850. Gilt full plate movement, chain and fusee, three-arm steel balance, fine florally engraved and pierced balance cock. White enamel dial with Ottoman numerals. A brass protective case covered with tortoiseshell decorated with studs, the outer case is gilded brass, the inner case also gilt-brass, case maker’s punch mark JB WW for Josiah Barnett & William Waters. Dial signed, movement numbered.
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Diameter: 55 mm
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Weight: 123 g
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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 worked between 1800 and 1868. His father was the English watchmaker John Prior (or Josephus Pryor) who was based in Nessfield. Edward ran a watch workshop in London with his brother George. The company/watch brand continued after Prior’s death.