Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 346:
1971, definitive issue, Flag and White House, top sheet margin plate No. and ZIP block of 20 (10×2), horizontal perforation strongly shifted to the bottom (approximately 12mm), representing 30 instead of 20 Flags on this unit, full OG, NH, VF and a spectacular item, Est. $400-$500, Sc. #1338F var
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