Marine and Navigation
A 6.5in.(16.5cm) radius micrometer sextant,
by Hughes & Son Ltd. London. Reading from -5 to 120 degrees and stamped 56556 on the arc. The index arm with constant tangent clamp, illumination lamp and micrometer. Fitted with two horizon and four sun shades. In a mahogany carrying case with dark lenses, three telescopes and oil tube, bearing a test certificate from the National Physical Laboratory dated April 1950.