Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1437:
1974, Telephone Centenary, 8c multicolored, imperforate top right corner margin plate block of four, full OG, NH, VF and rare, only two sheets of 50 were discovered, Unitrade C.v. CAD$5,000, Scott #641a
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