Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 725:
1941, inverted dark red overprint ”GK.-Ssarny” on 50k black, bottom sheet margin single of type II (premium 50%), printed on dark violet glazed paper, tiny natural inclusion at left, no gum as issued, NH, VF and scarce, G. Krischke certificate, Mi#4A K, C.v. €3,000, Est. $600-$700
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