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UNITED STATES - 1933-1972 PERFORATION ERRORS An interesting mostly never hinged mint assembly of various stamps showing spectacular PERFORATION SHIFTS presented on a stock page, includes 1933 3c Oglethorpe & 1952 3c Mt Rushmore blocks of 4 with shifted vert perfs, 1972 8c Stamp Collecting plate blocks of 4 (x2) with superb perforation error due to corner paper fold. Lovely fresh condition, attractive. (34 stamps)