Arnold. A Fine Silver Openface Pocket ChronometerSigned Jn. R. Arnold, London, Invt et Fecit, No. 2035, Case No. 2035, stamped with London Date letter For 1807Gilt-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, 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 180459mm diam.