細節
A ROYAL OBSERVATORY TWO-DAY MARINE CHRONOMETER
Charles Frodsham, London, No. 1842
the silvered dial signed Charles Frodsham, 7 Pavement, Finsbury Square, London. No. 1842, Roman hour numerals, Arabic five minute intermarkers, subsidiary seconds and up-and-down dials, fleur-de-lys hour and minute hands, all hands of blued steel, the Government Mark within the seconds dial, top-plate inscribed Charles Frodsham, London with the Government Mark, Earnshaw escapement, Pennington cut bimetallic balance with peripheral screws, blued steel helical balance spring with gallows assembly-stud to which top coil is pinned, spring foot detent (repaired; defective), the movement protected by inner brass drum, brass bowl and gimbal (lacking part of locking arm), in plain three-tier mahogany case, the centre section with rectangular ivory plaque to front inscribed Charles Frodsham, 84 Strand London. Two days, with Government Mark, outer guard box
87mm. dial diam, 140mm. sq. box
