lower right stamp in mint block of four (positions 37-38, 47-48), carmine overprint, stage III (14.Ab), additionally position 38 misplaced entry of basic stamp (14.21) and positions 47-48 "8" in Type B (14.12), very fine and rare with just 25 examples issued of the "Zone" in antique type error, a wonderful block, 1980 APS certificate (Scott $1,150 for 14a)