Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 151:
1940, American Educators, Frances E. Willard, large die proof of 5c in ultramarine, printed on India paper and mounted on sunken die card, proof size 75x90mm, card size 152x203mm, numbered ”622591A” on reverse and officially signed, VF and rare, PF certificate, C.v. $1,500, Est. $800-$1,000, Scott #872 P1
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