Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 74:
1932, triple black surcharge 6(c) on Airplane and Angels over the Globe 5c brown olive, block of four, nice and fresh with usual centering, full OG, NH or LH (top right stamp) and fine, scarce multiple as only 200 such errors were printed, each stamp with D. Forester guarantee hs, Greene Foundation certificate mentions this block as NH, C.v. $1,975++, Est. $800-$1,000, Sc. # C3c
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