Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 890:
1929, Iron Furnace, 20k green, perforation L10¾ instead of comb 12¼x12, nice state of preservation, full OG, NH, fine centering of this rare stamp, N. Mandrovski certificate, C.v. $10,000, Est. $4,000-$5,000, Scott #429a
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