Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 186:
1983, Civilian Conservation Corps, 20c multicolored, vertical pair imperforate horizontally with faint traces of vertical perforation, full OG, NH, VF and very rare, two PF certificates of 1997 and 2006, priced with ”-” in Scott, US Errors Catalog considered this pair as unique, Scott #2037b
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