A mahogany marine two day chronometer, no. 921-2530, 2450, Parkinson & Frodsham, circa 1842, 10.5 cm silvered dial with seconds and up/down subsidiary dials, fusee movement with maintaining power, Airy's compensation balance and helical spring, the brass bowl gimbal-mounted in a mahogany three tier case with ivory plaque inscribed Thos Cotterell & Co., London, swing handles