Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1445:
1921, trial blue surcharge 20,000r on 7r black and yellow, printed on vertically laid paper, top left corner sheet margin block of four with control text ”A 04 B” in black, additional surcharges on selvage, full OG, NH (hinged on margin far away from the stamps), VF and definitely unique positional multiple, only one sheet of 25 stamps with blue surcharge had been produced, each stamp with Romeko guarantee hs, Est. $5,000-$6,000, Sc. # 235
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