Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1176:
1929, Iron Furnace, 20k green, perforation L10¾ instead of comb 12¼x12, nice state of preservation, full OG, NH, fine centering of this rarity, N. Mandrovski certificate, C.v. $10,000, Est. $4,000-$5,000 , Sc. #429a
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