1917, 3¢ light violet, type I, imperf horizontally, vertical pair, o.g., very lightly hinged, exceptional centering, bright color, Extremely Fine, a rare imperforate error, with only 25 pairs issued; with Ward handstamp & 2012 P.S.E. Graded certificate (XF 90). Scott No. 501c  $2,500. $0 (Image)