The sextant has a grey/green lacquered brass curve-pattern frame and a wooden handle. The tangent screw, working against a spring load, and the clamping screw are positioned on the back of the index arm. The instrument has four shades, one green, two orange, and one red, and three horizon shades in red, orange, and green. Index-glass adjustment is made by a screw and on the horizon-glass by capstan screws.

Attached to the sextant is a magnifier, travelling on a worm wheel, with a frosted glass shade. There is also a threaded telescope bracket with perpendicular adjustment made by a rising-piece and a milled knob. The telescope is 159 mm in length with an inverted image and four cross wires. An extra drawtube is 46 mm long with an erect image and four cross wires. A second telescope is 92 mm long with an erect image. The sight-tube is 83 mm in length, with a green shaded eyepiece and an adjusting pin.

The instrument has a polished brass limb with inlaid silver scale from-5° to 149° by 10 arcminutes, measuring to 126°. The sextant has a silver vernier measuring to 10 arcseconds, with zero at the right.

The sextant is contained in a mahogany keystone box.