Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 662:
1943, Philatelic Exhibition in Zagreb, 18+9k black violet, perforated and imperforate blocks of four (the last one with tiny hinges at corners, mainly on margins) and six imperforate trial color proofs, all with full OG, NH, VF and rare group, Est. $600-$700, Scott #B39
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