Very rare English coach watch for Chinese market Circa 1780

Exceptional musical automaton with centre seconds
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Exceptionally rare English gilt, paste and pearl set open faced manually wound two train double dial musical automaton centre seconds coach watch made for the Chinese market, circa 1780. Gilt finished two train cylinder movement, chain fusee, musical pin barrel, playing on a nest of five bells on the hour or at will, visible finely pierced floral decorated gilt brass balance cock, diamond endstone. White enamel dial, small hour dial with Roman numerals, outer Arabic 60 seconds divisions, centre seconds hand and two subsidiary dials for ‘dance/song’ and ‘faster/slower’. Large case with a polychrome landscape to the back surmounted by an automaton scene depicting a harlequin tightrope dancer, dancing on the rope with moving legs and body in unison with the music, marvelled at by a gentleman and a lady looking out of her house, bezel and rim set with alternating split pearls and ruby pastes, finely pierced and engraved foliage decorated band, music and automaton activated by depressing a ruby set button in the pendant. Dial signed.
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Diameter: 90 mm
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Signed: George Margetts London