3c Proprietary part perforate (R18b), vertical pair, irregularly separated with clear to mostly huge margins which show portions of the next stamps at top and bottom, fresh bright color, neat ms. and embossed cancels, bottom stamp has horizontal crease and small margin tear, otherwise very fine, scarce multiple, only of only five recorded multiples (three are vertical pairs), with 1982 P.F. certificate, Scott retail $650.00 photo est.