History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 441:
1967, Baby Sisters, experimental test booklet tete-beche pane of 12 (2×3+2×3) with horizontal gutter in the middle, printed by British American Bank Note Company when developing their 1967 Centennial issue booklets, the left stamps are printed in dark green and the right ones in black, vertical fold along the gutter, no gum as produced, NH, VF, Est. $250-$300
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