Liberia, 1921, 1¢-$5 "1921" Overprint Official Pictorials Complete, "Specimen" Overprints. British P.O. specimen handstamps, without gum, 1¢ & 20¢ with inverted "1921" overprints, usual small flaws, F.-V.F. appearance, very rare with only 3 such sets are known. Scott No. O127S-O140S  Estimate $300 - 400. $0 (Image)