Very big English early silver verge watch with four cases Circa 1778

Pocket watch for the Ottoman market
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A very big early silver verge watch with four cases made for the Ottoman market by George Prior in London, England, circa 1778. The open faced case is crafted from silver and the first case is engraved, curved, has different weapons and a Star of David on back, the second case has a tortoiseshell decoration, the third case has English hallmarks 1778 and the fourth case also punched. The original champlevé dial has Ottoman numerals and original hands and the splendid numbered movement has a verge escapement, a bridge with the initials GP for George Prior and extravagant pillars.
Dial and movement signed.
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Diameter: 82 mm
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Weight: 277 g
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Signed: George Prior, London   
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Rare due to its four cases making it a  wanted collector’s watch.