Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 29:
NEAT AIR POST GROUP: 1923-30, ”Bo” overprints on Colombia SCADTA stamps of 5c-1p and registration stamp, plus Zeppelin set of 5 common values, full/large part of OG, F/VF, C.v. $278, Scott #C11/16, CLBO1-8, CFLBO1
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