Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 196:
1989, 100th Anniversary of the Montana Statehood, imperforated 5 stage proofs of 25c in blocks of four, mounted on large USPS page with inscription of colors, fresh, VF and extremely rare, only a few such pages were produced for presentation purposes, Est. $2,000-$3,000, Scott #2401
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