Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1183:
1922-23, Regular issue, 11c, 12c, 14c and 15c, perforation 11, set of four values in top or bottom sheet margin plate No. blocks of six, full OG, NH or LH (one stamp of block 15c), mostly VF, C.v. $625, Scott #563-66
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