Soviet Union - Pioneers Helping Post Issue
1936, 3k slate blue, perforation 11, bottom right corner sheet margin block of four printed on porous (so-called ''cotton'') paper with design is visible on reverse, lower right stamp with a dot between second and third ''C'' in ''CCCP'' variety, full OG, NH, VF, Est. $200-$250, Scott #585a var
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1936, 3k slate blue, perforation 11, bottom right corner sheet margin block of four printed on porous (so-called ''cotton'') paper with design is visible on reverse, lower right stamp with a dot between second and third ''C'' in ''CCCP'' variety, full OG, NH, VF, Est. $200-$250, Scott #585a var
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