Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 477:
1967, Baby Sisters, experimental stamps with no value indicated for test booklet, five blocks of four (two tete-beche blocks) and vertical tete-beche pair, colors – gray, bright blue and carmine, blocks in gray imperf vertically between stamps, others with straight edges, no gum as issued, NH, VF, Est. $400-$450
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