English gold open faced pocket chronometer Circa 1802-1803

Gold chronometer by George Jamison
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An English 18 carat gold open faced pocket chronometer, circa 1802-1803. Gilt full plate movement, spring detent escapement, jewelled to the fusee, free-sprung blued steel helical spring, diamond endstone, cut bimetallic balance with keystone-shaped moveable weights and timing screws. White enamel dial with Roman hours and outer minute divisions, subsidiary thermometer dial at 12 o’clock, subsidiary seconds at 6. Heavy plain case, stamped TH for Thomas Hardy, London Hallmark for 1802-1803. Movement signed.
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Diameter: 58.5 mm
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Signed: Geo. Jamison Charing Cross London
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Between May 1796 and February 1799, George Jamison partnered with William Howells and Paul Philip Barraud.