A rosewood eight-day marine chronometer, No. 859, T S & J D Negus, New York, circa 1870

4½-inch silvered dial with subsidiary seconds and up/down dials, signed and numbered T S & J D Negus, 100 Wall St., New York, No.859, fusee movement with Earnshaw's spring detent escapement, compensation balance and blued helical spring mounted on a substage, maintaining power, the brass bowl gimbal-mounted in a brass-bound case with swing handles, (second tier and lid lacking)