Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1681:
1941, inverted dark red overprint ”GK.-Ssarny” on 50k black, type II, bottom sheet margin single, printed on reverse side of dark violet paper (not glazed), no gum as issued, NH, VF and extremely rare, only 7 stamps of type II possible with double error, Z. Mikulski certificate, Mi #4A G K, var, C.v. €5,250
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