Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 669:
1939-40, Czechoslovak participation in NYC World Fairs, souvenir sheets Bratislava 1937 and Praga 1938, text in black and Arms in black, blue, red or green, full OG, NH, VF, Scott #239, 251 footnote
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