Heavy English silver chronometer pocket watch Circa 1802

Silver open faced watch by John Arnold
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A heavy English pocket chronometer John Roger Arnold London, museum quality, circa 1802. A silver, case and movement with matching number, London hallmarks, maker’s mark TH (Thomas Hardy), chronometer movement with spring detent escapement, OZ balance, diamond endstone, helical hairspring, plate completely signed and numbered, signed and numbered enamel dial (peripheral hairline), gold hands, in good condition, movement intact, cleaning recommended, very rare English collector’s watch.
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Diameter: 63 mm
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Weight: 204 g
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Signed: John Arnold, London
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John Roger Arnold (1769-1843) was the son of the famous English watchmaker John Arnold. John Roger first apprenticed to his father, the watchmaker John Arnold, and continued his training with Abraham Louis Breguet. In 1787 he became a partner in his father’s company, which was then called John Arnold & Son. His specialities were deck and pocket chronometers. In 1796 he became a master at the Clockmakers Company. In 1821 he received a patent for a compensation balance. From 1830 to 1840 he was the partner of Edward John Dent in the company Arnold & Dent. During their partnership, the two watchmakers were experimenting in different directions but focused on the effect of magnetism on chronometers.