Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 784:
1943, Philatelic Exhibition in Zagreb, 18+9k black violet, perforated and imperforated blocks of four (the last one with tiny hinges at corners, mainly on margin) and six imperforated trial color proofs, all with full OG, NH, VF and rare group, Est. $500-$600, Sc. # B39
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