Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 810:
1920, 50h yellow green, perforation 13½, two horizontal tete-beche pairs, one with gutter in the middle, large part of OG, VF, various experts’ hs, Pofis #156TBa, TBb, Scott #87a
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