Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 18:
1924, National Aviation School, 10c-5b, complete set of seven, positional blocks of six (2×3) 10c, 25c and 50c, three-side margin block of ten (5×2) of 2b with complete inscription on bottom selvage, perforated proof of 10b in brown orange and black and more, full OG, NH or LH/hinged, mostly VF and interesting assemblage, Est. $300-$400, Sc. #C1-7
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