English pocket chronometer in manner of Earnshaw Circa 1824

Open faced 18 K pocket watch by John Frodsham
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A heavy English 18 K gold pocket chronometer watch in manner of Earnshaw with hallmarks 1824.
18 carat gold case from case maker William Webb with monogram and London hallmarks 1824; movement with chronometer balance with trapezoidal weights, cylindrical hairspring, screwed gold chatons and the main plate signed and numbered; original white enamel dial with Roman hours, Arabic minutes, sunk subsidiary dial with Arabic seconds, original hour gold hand, replaced minute hand and also signed and numbered.
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Diameter: 55 mm
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Weight: 152 g
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Signed: Frodsham Gracechurch St. London
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John Frodsham (1785-1849) was a gifted watchmaker. He was the grandson of the famous William Frodsham.