Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 247:
1943, Flag of Czechoslovakia, 5c blue violet, blue, red and black, side margin horizontal strip of five, stamp with double impression of ”Czechoslovakia” at right, full OG, NH, VF, a copy of PSE certificate for pane of 50, position of the strip shown, C.v. $600, Est. $250-$300, Sc. # 910a
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