Quadruple cased clockwatch for Turkish market Circa 1783

Silver and horn quarter striking verge by Daniël de St Leu
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A large English silver and horn quadruple cased quarter striking verge clockwatch made for the Turkish market, Hallmarked London 1783. Full plate fire gilt movement with signed and numbered gilt dust cover, pierced and engraved cock, pierced and engraved foot and plate for the silver regulator disc marked in Turkish numerals, fusee and chain with worm and wheel barrel setup between the plates, plain three armed steel balance, blue steel spiral hairspring, large resting barrel for the striking train sounding two blows for each quarter of the hours on a bell in the case. White enamel dial signed for the retailer, George Prior, Turkish hour and five minute numerals, blue steel beetle and poker hands. Four cases, the most inner silver chased, pierced and profusely engraved case with long silver pendant, later bell, steel strike/silent lever, silver pierced and engraved outer case with large vacant oval cartouche, maker’s mark WW, third protective case covered in green horn, silver bezels, pierced roundels and pique pins in a large foliate pattern, large fourth case covering the dial, probably locally made of silver, engraved with a star and foliate decoration to the front.
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Diameter: 77 mm
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Depth: 18 mm
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Signed: George Prior London – Dan De St Leu Sert to Her Majesty London
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Daniel De St Leu, 1753 – 1797. Born in Switzerland. He was an eminent maker of the period who often produced watches for export. In 1765 he became watchmaker to Queen Charlotte, wife of George III.