Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 49:
1932, double black surcharge 6c on 5c brown olive, block of four, full OG, previously hinged, fine and rare multiple, Greene certificate, C.v. $2,600++, Unitrade C.v. CAD$3,400 as singles,Scott #C3b
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