Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 197:
1989, 100th Anniversary of the Montana Statehood, imperforate 5 stage proofs of 25c in blocks of four, mounted on large USPS page with inscription of colors, fresh, VF and extremely rare, Est. $3,000-$4,000, Scott #2401
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