A black enamelled and lacquered brass double 'A' frame sextant, with inset silver scale to brass arc signed Troughton, London, platina 1021, the index arm with framed vernier scale and magnifier with circular shade, tangent screw and clamp, seven shades and mirrors, telescope mounting with screw adjustment, with sun inverting and star telescopes in shaped mahogany case - 13½in.(34.3cm)wide