Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 784:
1941, inverted dark red overprint ”GK.-Ssarny” on 50k black, type I, printed on reverse side of dark violet paper (not glazed), no gum as issued, NH, VF and rare, only 15 stamps with double error possible, G. Krischke certificate, Mi #4A GK, C.v. €3,500++
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