Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 519:
1978, National Resources, 14c+14c multicolored, top sheet margin vertical se-tenant pair, top stamp has double impression (ghost) of brown color, while bottom one has double impression of silver, full OG, NH, VF, C.v. $600 (for double impression of brown only), Unitrade C.v. CAD $1,300, Est. $300-$400, Sc. # 766b-765i
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