English triple cased clock watch for Islamic market Circa 1790

Gold quarter striking clock watch
–
A very rare English, 18 Carat gold and underpainted horn, triple cased, two train, quarter striking clock watch, circa 1790. With a five strand gilt metal chain and crank key. It was made for the Islamic market by Daniel de St. Leu, Watchmaker to Her Majesty, London. Outer: Horn under painted in imitation of moss agate, gold piqué work decoration, gold bezels and pierced and engraved sound holes. Second: Gold, the back engraved with a musical trophy, repoussé border, the edge and bezel pierced and engraved for sound. Inner: the back is engraved with flowers, a finely pierced band with engraved foliate scrolls. Gilt brass dust cap.
–
White enamel dial with radial Islamic numerals, outer dot minute divisions and Islamic five minute markers. Gold beetle and poker hands. A gilt brass full plate movement with ring turned cylindrical pillars, fusee and chain, verge escapement, three arm balance, flat balance spring, gilt brass single foot balance cock pierced and engraved with scrolling foliage, silver regulation dial with Islamic numerals, striking with two polished steel hammers on a bell in the back of the case, strike silent selection lever on the bezel.
Dial, dust cap and movement signed.
–
Diameter: 72 mm
–
Signed: Daniel de St. Leu  London
–
The case is slightly chipped.
–
Daniel De St. Leu This fine maker succeeded Rivers & Son in the post of the maker to the Queen in 1765. It is easy to see why Queen Charlotte favoured St. Leu’s work as it is always delicately executed and often uses floral or musical motifs. The interest in the horology of her husband, King George III, cannot have failed to have had some bearing on the Queen’s own choice of her watch and clockmakers.