Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 14:
1924, National Aviation School issue, 10c-5b, perforated complete set of seven and 2b brown and black in bottom sheet margin vertical imperforated pair, full OG, NH (pair and several low values of the set) or LH/hinged, VF and scarce only 50 imperforated pairs possible, C.v. $462.50 as hinged, Est. $300-$400, Sc. #C1-7, C6 imp
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