Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 35:
Description
1921, black overprint ”Air Mail to Halifax…” on Iceberg 35c red, block of four, containing two stamps with normal overprint, two stamps with a period after ”1921”, one of which has 1½mm space between ”Air” and ”Mail”, positions 16-17/21-22 of 25- stamp setting, full OG, NH, VF, Briefmarkenpruefstelle Basel certificate, Unitrade C.v. CAD$1,800 as singles, Est. $600-$800, Scott #C3, b, h
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