A 'Three Circle' Pattern 8inch radius vernier sextant, signed and numbered on the main arc H Hughes & Son Ltd, 59 Fenchurch St, London EC 12701 inset silver scale magnifier, seven shades, sun inverting and star telescopes and other accessories, with National Physical laboratory Certificate dated July 1920, (lacking clamp to index arm) in mahogany carrying case -- 11in (28cm) wide