A fine tulip oxidised brass framed vernier sextant, the main arc with silvered scale and engraved SEWILL Maker to the Admiralty Glasgow, the index arm with swivel magnifier, tangent screw adjustment and locking screw, seven shades, mirror four telescopes and tommy bar in fitted mahogany case with trade labels for D.McGregor & Co 57 Fenchurch St. London E.C. and De Kemel Brothers Opticians Antwerp - 10½in(27cm)wide; Radius - 7in(17.8cm)