Pocket box sextant in leather case, made by Elliott Brothers, City of Westminster, London, England, 1853-1860. Consists of two circular lacquered brass plates (76mm) with lid that acts as a handle when used. Fitted with Inlaid silver scales, the index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Marked ‘Lt. E.J. Bori, Royal Engineers’.