Gilt rare double faced astronomical coach clock Circa 1780

Very big astronomical coach clock
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A rare English double faced astronomical coach clock for the Chinese market, William Vale London circa 1780, fire gilt case with jewels on both sides, both sides glazed, enamel dial on both sides.
Full plate fire gilt movement with verge escapement. 1st Dial with hours and minutes. 2nd dial time zone, date, moon age and centre seconds on back, dial signed. Winding through the back.
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Diameter: 81 mm
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Weight: 304 g
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Signed: William Vale