unmounted mint Block Larger Than four Sheet Accumulation, 1920's-1940's, 41 better sheets, incl. nos. 553, 627, 628, 713, 740-749, 921 (2 with "Korpa" plate flaw), C7-C9, C19, minor duplication, never hinged, few usual perf separations & margin flaws, fine-very fine, Scott retail $3,725.00+