[WALTER, A. B. (1820-1875), engraver]. Full-Length Portrait of General George McClellan on Horseback, after G. Schussele. [Philadelphia: John Dainty, 1863]. Proof copy of this large engraved portrait (“PROOF” at the lower right corner). Sight approximately 30 ¾ x 20 ½”. Matted and framed under glass. Frame size approximately 40 ½ x 31”. Mild visible foxing to print, some wear to frame. Fine. A rare proof copy of this handsome portrait. This image was later used for McClellan’s 1864 presidential campaign in his run against Abraham Lincoln.