Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 904:
1920, black overprint ”Plebiscite. Olstyn. Allenstein” on 5pf-40pf, unissued compete set of five, full OG, NH, VF, each stamp with Z. Mikulski hs, C.v. $725, Michel #II-VI, €900, Scott #1-14 footnote
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