Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 478:
1971, black decimal surcharge 1½p on H.M.S. Challenger 4p orange and black, vertical imperforated strip of three, vertical pre-printed paper fold, still full OG, NH, F/VF and very rare especially in multiple, only sheet of 60 stamps was found imperforated, Est. $250-$300, Scott #143 var
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