Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 723:
1941, inverted dark red overprint ”GK.-Ssarny” on 50k black, basic stamp of type I, printed on reverse side of dark violet paper (not glazed), no gum as issued, NH, VF and rare, only 25 stamps of all types with double error possible, G. Krischke certificate, Mi #4A GK, C.v. €3,500++, Est. $750-$800
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