Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 16:
1924, National Aviation School, 10c-5b, complete set of seven, diagonal black overprint ”Specimen” and puncture at right, full OG, NH (4) or LH/hinged, mostly VF, Est. $150-$200 , Sc. #C1-7
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