Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - Newfoundland - 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