Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1364:
1968, 8th Anniversary of NLF, 30xu+30xu, left sheet margin block of four, contains two horizontal se-tenant pairs, all four stamps have omitted yellow background, usual perforation, no gum as issued, NH, VF, only a part of sheet with this error has been discovered, a common pair is included for comparison, Est. $400-$500, Scott #21-22 var
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