Large musical coach clock for the Chinese market Circa 1790

Impressive gilt metal, paste and pearl set striking coach watch by Brockbank
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An impressive, very rare English gilt metal, paste and pearl set pair cased open faced two train musical and striking coach watch made for the Chinese market, circa 1790. Full plate gilt finished two train cylinder movement with finely engraved floral decoration, chain fusée, musical pin barrel, playing on a nest of four bells via six steel hammers at will, finely pierced and engraved foliage decorated dust cover. White enamel dial, eccentric time display with Roman numerals, Arabic five minute divisions, center seconds, three subsidiary dials for Chime/Not Chime, seconds and Minuet/Gavot. Large inner case with finely pierced and engraved foliage decorated band, similarly decorated outer case with alternating split pearl and red paste set bezel, center seconds and music start lever in the bezel. Movement and dust cap signed, inner case stamped with casemaker’s initials IB.
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Diameter: 134 mm
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Signed: Jn Brockbank London No. 1