Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1369:
1925, Numerals, 1k red, 2k lilac, 8k green and 10k dark blue, imperforated complete set of four (3k, 7k and 14k are not known imperforate), litho printing on wove paper, full OG, LH, VF and extremely rare, each stamp with N. Mandrovski certificate, some specialists are considering these stamps as plate proofs, Est. $8,000-$10,000, Sc. #J11-12, J16-17 imp
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