English fire gilt deck watch for the Chinese market Circa 1780

Pair cased deck watch by Timothy Williamson
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A fine and extremely rare, early, large English deck watch with stoppable seconds and open face, made for the Chinese market, circa 1780.
Fire-gilded full-plate movement with verge escapement, stoppable seconds, fusee and chain, and cock with grotesque face. Enamel dial with Roman radial hours, outer minutes track with Arabic five minutes numerals, subsidiary dial for the seconds, and presumably original hands. Floral engraved motifs and geometrical decoration on the outer case back, the front edge with red and white stones, the inner case plain with case maker’s mark TH for Thomas Hardy. Movement signed and numbered.
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Diameter: 64 mm
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Weight: 170 g
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Signed: Tim Williamson London