Etched portrait, by W (?) Burton

A clean copy, on good thick paper, of an engraving, three versions of which are in the National Portrait Gallery (NPG D8332, NPG D8333, NPG D8334), where they are dated 1889, and described as being etched 'after a photograph originally published in the Pall Mall Gazette 'Grand Old Man' extra'. Dimensions of paper roughly nine inches by six, dimensions of image roughly five inches by four. Burton's signature is faintly etched at the foot of plate, and the print is docketed in pencil 'W E G' at the foot of the paper, with 'Burton 1/-' on reverse.