English silver engine turned chronometer watch Circa 1805

Silver keywound chronometer by John Roger Arnold
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An English silver open faced keywound chronometer watch, circa 1805. Full plate gilt finished spring detent escapement, Z balance, blued steel helical hairspring, diamond endstone, engraved balance cock with dragon motif. White enamel dial with Roman numerals, large subsidiary seconds and blued steel hands. Engine turned case, hinged back. Case stamped TH for Thomas Hardy, with London date letter for 1805 and numbered, dial and movement signed and numbered.
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Diameter: 62 mm
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Signed: Arnold 1969 – Jn. R. Arnold London Inv. et Fecit