The sextant has a grey crackle-lacquered aluminium three-circle pattern frame and a wooden handle. The white plastic micrometer drum, pressure clamp and a worm screw are located on the back of the index arm. The instrument has four shades, three green and one grey, and three horizon shades, two green and one grey. Index-glass adjustment is made by a screw and on the horizon glass by capstan screws. Attached to the sextant is a threaded telescope bracket that is non-adjustable. The telescope is 74 mm in length with an erect image. Accompanying the sextant is a green shaded eyepiece and an adjusting pin.

The instrument has an aluminium scale from -5° to 125° by 1 arcminute, measuring to 122°. Micrometer to 0.2 arcseconds.

The instrument is contained in a square fitted wooden box, with a Kelvin Hughes certificate of examination in the lid, dated 2 August 1967.