English self strike watch for the Ottoman market Circa 1810-1820

Gold pair cased pocket watch by Daniel De Saint Leu
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A rare and fine, English, key winding, pair cased, two train pocket clock watch with open face, made for the Turkish market, circa 1810-1820.
Round shaped, 18 Carat yellow gold and varicoloured gold case with rose cut diamonds. Case back chiselled in varicoloured gold with an impressive military trophy, including flags, cannon and bullets, axe and lictor beam (fasces lictoriae), helmet and shield, etc.; bezel set with rose cut diamonds. Enamel dial with Ottoman numerals and filigree hands. Full plate, gilded brass movement, engraved with scrolls, with fusee and chain, verge escapement, monometallic balance (polished brass), blued steel flat hairspring, and a pierced and engraved gilded English cock.
This rare watch has one horological complication: Striking the hours and the quarters in passing on one bell (function activated by the push bolt at 3 o’clock).
Movement and dial signed and accompanied by a protective case in gilded brass and home.
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Diameter: 53.5 mm
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Signed: Daniel de Saint Leu London
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Spectacular watches such as this were made for the Ottoman Empire, including Turkish, Persian, and Egyptian markets. Similar watches are kept in the Topkapi Museum in Istanbul.
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Daniel de Saint Leu (1753-1797), London: Watchmaker to George III and Queen Charlotte from 1765 onwards; in 1753, he was established in Cloak Lane at ‘The Golden i-lead’. Later, he moved to 38 Cornhill and was succeeded in about 1790 by Rivers & Son. He made watches with quarter repeaters and clock watches, with verge and cylinder escapements, most in very ornate cases, sometimes with diamonds or other gemstones. While he specialised in watches for Eastern export markets, he is also known to have made a few very special pieces for the Spanish Court. A production, signed under his name, existed at the beginning of the 19th century; it was undoubtedly made in Geneva.