Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - 1928, Allegory of Flight, 5c brown olive, top sheet margin plate No.A-1 imperforate block of four, perfect quality, full OG, NH, VF and rare, Unitrade #C1a, C.v. CAD$2,700 for imperf plate block of six, Est. $500-$600 , Scott #C1a