English large silver Ottoman quadruple case verge watch Circa 1837

Silver pocket watch with niello outer case
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A large  English silver key wind quadruple case pocket watch with painted horn and studded outer case and further silver and niello outer made for Ottoman market, London Hallmark for circa 1837. Gilt full plate fusee verge, pierced and engraved balance cock with steel 3 arm balance, silvered regulation disc.
Polished inner cases, third tortoiseshell case with stud decoration, Ottoman quadruple outer case with silver and niello and foliate decoration.
The white enamel dial has black Ottoman numerals and black iron hands. The numbered movement has a typical verge escapement for the Ottoman market with fancy pillars and magnificent decoration. Dial and movement are signed.
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Diameter: 63 mm
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Signed: Edward Prior, London
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Especially worth mentioning for this watch is the fantastically preserved original protective case, which is almost always missing.
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Edward Prior
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 and watch brand continued after Prior’s death in 1868.