English quadruple verge for the Turkish market Circa 1790

Silver quadruple tortoiseshell cased clock watch by Daniel De Saint Leu for George Prior
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An English silver quadruple tortoiseshell cased open faced clock watch made for the Turkish market, circa 1790. Gilt full plate fusee verge movement, pierced and engraved balance cock, 3 arm balance, two polished steel hammers striking on a bell, silver regulation with Turkish markers. White enamel dial, black Turkish numerals, black outer minute track with Turkish five minute markers, blued steel beetle and poker hands. Pierced and engraved silver inner cases, third tortoiseshell case with piqué work decoration, polished silver outer case. Comes with a white metal chain and 2 keys. Movement and dust cover signed by Daniel De Saint Leu and dial signed by George Prior.
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Signed: Dan. De St Leu Ser. to Her Majesty – George Prior London
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Diameter: 78 mm
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Daniel de St. Leu originally came from Geneva and worked from 1753 to 1797; he created some of the most beautiful and intricate watches of the eighteenth century. In 1765 he was appointed watchmaker to Queen Charlotte, wife of King George III – the fact that all of de St. Leu’s watches after this year are either signed ‘Sevt. to her Majesty’, or ‘Watch Maker to her Majesty’ is proof that he held this title for the rest of his life.
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De St. Leu was specialized in the production of watches for the wealthy Ottoman market, where the clientele wanted their watches to be pieces of jewellery, often in lavish gold cases with elaborate decoration and set with precious stones. In the 18th century, English watches were very much in demand on the Ottoman market and exported in great numbers from England. R. Rolt states in ‘A New Dictionary of Trade and Commerce’, 1756, that “Great quantities of watches are exported to Asia, particularly to Turkey; where they serve more for ornaments like pictures in rooms, than for use in pockets.” Daniel de St. Leu created movements of superior quality and put them in extravagant cases – the perfect timepieces for the Ottoman market.