English pair cased coach clock for the Chinese market Circa 1780

Open faced coach clock watch by Timothy Williamson
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Large pair cased and complex, English, gilt brass, coach clock with quarter striking, two train, and stoppable centre seconds made for the Chinese market, circa 1780.
Case back engraved in taille douce (fine cut) with geometric patterns and flowers; bezel set with alternating red and white paste stones. One horological complication: Striking the hours and the quarters in passing on one bell by two hammers (function activated by the push bolt at 3:30). Enamel dial with Roman radial hours, outer minutes/seconds track with Arabic five minutes/seconds numerals, and gold Poker & Beetle hands. Full plate, key winding, gilded brass movement, engraved with scrolls and flowers, with fusee and chain verge escapement, monometallic balance (polished steel) and blued steel flat hairspring, pierced and engraved gilded English cock, and cabochon ruby end stone; standing barrel for quarter striking; stop balance (push bolt at 7:30). Movement signed.
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Diameter: 98 mm
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Signed: Timothy Williamson London
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Timothy Williamson, English goldsmith and watch dealer
Timothy Williamson was trained as a goldsmith and probably did the design and engraving of its exceptional cases himself. The works, however, were likely supplied by William Hughes, with whom Williamson was closely associated, as Roger Smith has pointed out in an article for Antiquarian Horology. In Britten’s book Old Clocks and Watches and Their Makers, Timothy Williamson is listed as active in London from 1769 to 1788, first in Fleet Street and later in Great Russell Street.
Timothy Williamson made his fine watches and jukeboxes for the Emperor of China, among others, which can be seen in the Carnegie Museum in Pennsylvania, the Peiping Museum and the Palace Museum in Beijing.