Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 496:
1922-25, three blocks of four of 4c, olive bistre (wet), olive yellow (wet) and yellow ocher (dry), very well centered with intact perforation, full OG, NH, VF, C.v. $1,800, Unitrade #110, b, d, CAD$3,360++, Est. $800-$1,000, Sc. # 110, var
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