English gold watch with Massey-III escapement Circa 1825

Gold open faced lever watch
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A rare, heavy English pocket watch with Massey-III escapement and Liverpool Windows by William Robinson , circa 1825.
An 18K gold, typical Liverpool case with relief rim, case punch H&T, original dome, fine Massey movement type three, large screwed sapphire bearings, so called “Liverpool Windows”.
Diamond endstone, bimetallic balance, stoppable seconds, four colored gold dial, solid 18k gold, golden Breguet hands
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Diameter: 50 mm
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Weight: 126,5 g
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Signed:  William Robinson   Liverpool
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Good condition, minimal defect on the edge of back, in working order.