Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 702:
Description
1926, definitive issue, imperforate plate proofs of 8k on chalk-surfaced paper, considered to be proofs of 8k stamp on improved paper (Standard Cat. #0121), five vertical gutter pairs in carmine, orange, yellow green, light blue and magenta, full OG, NH, VF and rare in such format, Est. $2,000-$2,500, Scott #283
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