Lot 628, Canada 1942 six cent deep blue Airmail vertical imperf pair, XF NH, sold for C$776 July 24, 2020October 26, 2018 by Sparks Auctions Lot 628 Canada #C7a 1942 6c deep blue Air Mail Imperforate, a mint never hinged vertical imperforate pair, scarce with only 50 pairs recorded, extremely fine. Unitrade CV$1,200, sold for C$675.00 plus 15% buyer’s premium.