English silver pair cased key wound pocket watch Circa 1780

Silver verge in pair cases
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An English silver pair cased key wound pocket watch, circa 1760-1780. The movement with a verge escapement. White enamel dial with Roman hours, an outer minute track, Arabic five minute numerals and gold hands. Both cases are smooth. Dial signed. Comes with the original key.
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Diameter incl. outer case: 50 mm
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Weight: 104 g
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Signed: De St. Leu London
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The locking mechanism for the dome is damaged.
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Daniel De St. Leu was a Genevan of origin. As a watchmaker, he worked in Geneva and London. De st. Leu was listed in London from 1753 until 1797. 

He manufactured some of the most exquisite and elaborate watches of the 18th century. Gaining royal favour, he was appointed watchmaker to Queen Charlotte, wife of King George III, in 1765, a title he held for the rest of his life, since all his watches after this date are either signed ‘Sevt. to her Majesty’ or ‘Watch Maker to her Majesty’.

He crafted movements of superior quality and specialized in making watches for affluent Ottoman clients, who requested their watches to be as pieces of jewellery, preferably in lavish decorated gold cases and set with precious stones. In the 18th century, the export of English watches to the Ottoman Empire was conducted on a large scale.