Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1254:
1936, Pioneers Helping Post, 2k brownish red and 3k deep blue, perforation 11, two unfolded blocks of four on porous (so-called ”cotton”) paper with design visible on gum side, full OG, NH or VLH (one stamp of each block), VF, Est. $250-$300, Sc. # 584a-85a var
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