A two-day marine chronometer with Poole auxilliary Usher & Cole No. 2100, the silvered dial signed Usher & Cole London. Makers to the Admiralty No.2100, Roman hour numerals, subsidiary seconds and up-and-down dial, blued steel hands, Earnshaw escapement, cut bimetallic balance with Poole auxilliary, circular heat compensation weights, palladium helical balance spring, spring foot detent with jewelled locking stone, brass bowl, gimballed in plain three-tier mahogany box (lacking top lid), flush recessed brass handles, bone ivory plaque inscribed Usher & Cole 2100 London, with outer guard box, dial dia -- 4in. (10.2cm.), box -- 7in. (18cm.) wide