Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 633:
1922, black metal surcharge 50,000r on Soviet stamp of 3000r brown and blue, vertical tete-beche pair, upside down stamp has upright surcharge; in addition a single with double surcharge, no gum as produced, VF and very scarce, several experts’ hs on reverse, including Dr. P. Jemtschoujin, Standard Cat,. #5 I TB, C.v. $300, double surcharge is not listed in this catalog, Est. $200-$300, Scott #35, var
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