Fine English silver open faced pocket chronometer Circa 1807

Silver chronometer by Arnold
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A fine English silver open faced pocket chronometer, circa 1807. Gilt finished Arnold spring detent movement with detent set in to top plate, bimetallic Z balance with compensation weights, blued steel helical hairspring, diamond set endstones. White enamel dial with Roman numerals, outer calibrated minutes track, subsidiary seconds, blued steel spade hands, polished circular case. Dial and movement signed, movement numbered, case numbered and stamped with casemaker’s marks TH for Thomas Hardy and London date letter for 1807.
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Diameter: 59 mm
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Signed: Jn. R. Arnold London Invt et Fecit