Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 235:
1993, Classic Books, 29c multicolored, proof pane of 40 stamps, containing ten se-tenant blocks or strips of four, perforated horizontally at top and vertically between stamps of the upper row only, imperforate everywhere else, full OG, NH, VF, C.v. $4,000 as ten blocks, Est. $1,200-$1,500, Scott #2788a P
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