Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1669:
1919-22, 18 trial color imperforate proofs, including 2 for National Republic issue, 12 for Soviet issue and 4 for semi-postal issue, creamy, smooth or laid paper, no gum as produced, VF, Est. $500-$600, Scott #1/29, B1/4
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