Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1502:
1918, red overprint in Cyrillic type on 5h deep green, horizontal pair, full OG, NH, VF and scarce, stamps bearing red overprint had never been officially issued and some specialists considered them as proofs, expertized by D. Marjanovic, Mi #18 IIb, €1,000 as singles, Est. $300-$400, Sc. #1LE2b var
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