Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 461:
1920, black surcharge ”THREE CENTS” with bars 13½mm apart on Seals 15c scarlet, pane of 25 represents complete setting, stamp on position 24 showing raised second ”E” in ”THREE”, nice centering, full OG, NH (16) or hinged, VF, C.v. $717.50 as singles, Unitrade C.v. CAD $1,050++, Est.$300-$400, Sc. # 129, var
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