unmounted mint Block Larger Than four 1930, 1c-1p Spanish American Union Exhibition, 5c-1p air post, 20c special delivery (433-445, C50-C55, E9), all in blocks of twenty-five, no. 443 is a block of twenty-three and pair, o.g., some sheets imperfectly gummed resulting in portions of some being ungummed, creasing and some perf. separations, majority still mostly fine-very fine, Scott retail $226.00