A fine 'three circle' oxidised brass framed vernier sextant the main arc with silvered scale and engraved SEWILL MAKER TO THE ROYAL NAVY LIVERPOOL No5616 the index arm with swivel magnifier, tangent screw adjustment and locking screw, seven shades, mirror, three telescopes and tommy bar in fitted mahogany case -10¼in(26cm)wide; radius - 6¼in(16cm)