Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1497:
1967, Baby Sisters, experimental test booklet pane of ten (2×5), printed by British American Bank Note Company when developing their 1967 Centennial issue booklets, top left stamp is in blue, 2nd stamp at left in blue and gray, others at left – in gray, while stamps at right in dark green, no gum as produced, NH, VF, Est. $300-$400
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