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.
£150 - 250
US$ 230 - 380
180 - 290
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