unmounted mint Block Larger Than four 1926, 15c-4p Red Cross, 5c-1p air post (B14-B18, CB1-CB5), all in unused blocks of fifty, full o.g., never hinged, some perf. separations, few light gum bends, ten 15c stamps creased, and four 5c air post have grease mark, vast majority very fine-extremely fine, Scott retail $2,605.00