Heavy gold English pocket watch chronometer Circa 1816

Heavy gold pocket watch chronometer
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An English pocket watch chronometer by John Newton London, circa 1816, 18 carat gold, case maker’s punch WM, probably William Mean, original dome.
English Chronometer movement with spring detent escapement, big chronometer balance, 4 screwed gold chatons, bridge with engraved grotesque face, main plate signed John Newton London, original and signed.
Enamel dial, original gold hands, London chronometer maker 1790-1824.
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Diameter: 54 mm
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Weight: 152 g
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Signed: John Newton London