Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 722:
1922, black surcharge 50k on imperforated 25,000r gray blue, vertical tete-beche pair with gutter in the middle, folded once between stamp and gutter, nevertheless full OG, NH, VF and extremely rare, this positional piece is not recorded in catalogs, Est. $1,200-$1,500, Sc. # 381 var
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