Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 38:
1929, Commercial Airways, Ltd., ”VIA AIR”, imperforate trial color proofs of (10c) in green, light carmine, yellow and orange, each one has bottom right corner margin, printed on thin white card, no gum as issued, NH, VF, Unitrade #CL47ii, C.v. CAD$1,200, Est. $300-$350, Scott #CL47
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