Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 919:
1941, black trial boxed surcharge ”Pleskau. 20kop” on aviator 30k blue, cancelled on a piece by Pskov ”14.8.41” date stamp, F/VF and rare, expertized by D. Schlegel, Mi #2P1, C.v. €4,000
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