Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 722:
1941, dark red overprint ”GK.-Ssarny” on 50k black, basic stamp of type II (premium 50%), printed on reverse side of dark violet paper (not glazed), neat corner cancel on a piece, VF and scarce, G. Krischke certificate for a cover from which this stamp was originated, Mi #4A G, C.v. €3,750, Est. $600-$750
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