A mid-Victorian two-day marine chronometer, the silvered dial with Roman hour numerals enclosed by an outer minute band with Arabic numerals, inscribed Heron & Son, Greenock, No. 189, with subsidiary seconds and up-and-down dials, gold and blued steel hands, the single chain-driven fusee movement with blued steel helical balance, brass bowl and gimbal, in brass-bound mahogany three-tier box, the sides with brass drop handles, the frieze with shaped rectangular ivory plaque, the dial 103mm diameter