Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1082:
1936, Pioneers Helping Post, 3k deep blue, perforation 14, unfolded block of four on porous (so-called ”cotton”) paper with design visible on gum side, full OG, NH, VF, Est. $200-$250,Scott #585 var
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