Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 559:
1932, Postal Seal, imperforate proof of 1pi red and deep blue (issued colors), complete unfolded sheet of 80 (4×20), $80-$100 is competitive price for a single proof, full OG (slightly toned strip at top mainly on margin), NH, VF and rare multiple, SG #A1, Est. $4,000-$5,000, Scott #M1
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