A Georgian brass flat frame sextant, No 92 by Joseph Jackson, London, c.1760, with index mirror, horizon glass with level adjustment, 2 pivoted shades, double pinhole sight, engraved silvered scale to the arc signed ' Jo. Jackson. N.92', 6in. radius, fitted mahogany box probably 19th century, 7.75in.
Compare a similar sextant by Joseph Jackson c.1759 in the Science Museum, London, Inventory No.: 1981-978, which is numbered '54'.
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Sold for £2,600