Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1343:
1921-23, 20pf and 5fr in blocks of four and black shifted to the right surcharge 15c on 40pf in block of six with left stamp in the middle placed upside down and forming either vertical or horizontal tete-beche pair, full OG, NH, VF, C.v. $427++, Scott #70, 88, a, 116
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