Liberia, 1936, 6¢ on 1¢ Green, on Regular Issue Error. Wax interleaving as always, very well centered for the issue, strong bright color, Very Fine, a lovely Liberian Airmail rarity with only ten copies discovered; with 1959 P.F. certificate, signed Kessler and accompanied by 1960 letter. Scott No. C3m  $750. $0 (Image)