A mid-20th century marine chronometer, the two day chain fusee movement with Earnshaw type spring detent and bimetallic balance, the 4¼-inch silvered dial with black Roman hour numerals, subsidiary seconds and state of wind dials, inscribed 'Thomas Mercer' and numbered '20469', housed in a lacquered brass bowl hung in gimbals, the walnut case with glazed hinged lid, height 17cm, with applied brass plaque inscribed 'Supplied by G. Falconer & Co (H.K.) Ltd Union Building Pedder Street Hong Kong No. 20469'.