Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 439:
1967, Baby Sisters, experimental horizontal gutter tete-beche test booklet pane of 16(4×2+4×2), one or two-color printing – gray, green/blue, green and blue, printed by British American Bank Note Company when developing their 1967 Centennial issue booklets, no gum as produced, NH, VF and rare layout, Est. $400-$500
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