Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 328:
1923, McKinley, large die proof of 7c in black, printed on India paper and mounted on sunken die card, proof size 60x73mm, card size 152x202mm, numbered on reverse with ”332720”, no gum as produced, VF and scarce, C.v. $1,000, Est. $400-$500 , Sc. #559P1
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