Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 177:
1919, two stamps with inverted or double red wings surcharge 30c on Ruins of Aqueduct 35c olive green and brown, full OG, NH (inverted surcharge) or LH, VF, C.v. $410, Est. $150-$200 , Sc. #C1a, b
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