A Two-Day Marine Chronometer, the silvered dial signed and numbered Parkinson & Frodsham, Change Alley, London 2378, Roman hour numerals, Arabic numeral 5-minute intermarkers, subsidiary seconds and up-and-down dials, blued steel hands, convex glass, top-plate engraved Parkinson & Fodsham, London, Earnshaw escapement, spring foot detent with jewelled locking stone, cut bi-metallic balance, segmented heat weights, blued steel helical balance spring, the top curve pinner to 'gallows' assembly, contained in sprung dust cover, brass bowl and gimbal (missing part of locking assembly), in plain 3-tier mahogany box (later lid), ivory plaque to front of bottom section inscribed 2378 -- 6¼in. (16cm.) square