Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 774:
1921, 25th Anniversary of the National Post Office, black overprints on 1c-10c, complete set in blocks of four, three of which with marginal imprint, full OG, NH, VF, C.v. $395 as hinged single sets, Scott #39-42
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