1919, 1¢ gray green Offset, perf 12½, imperf vertically, left margin horizontal strip of 3, o.g., lightly hinged, exceptional centering within wide margin, bright color, Extremely Fine, a rare and undercataloged variety; Colman guarantee backstamp, with photocopy of 1990 P.F. and 2010 P.F. certificate for a block of 6. Scott No. 536a  $1,200 for pair. $0 (Image)