1928 UNDERPAID MAIL CANADA TO LONDON. Envelope from Canada addressed to the stamp dealers "Bright and Son, 164 Strand, London" with Canadian 2c green embossed cancelled SWIFT CURREN/SASK., postage underpaid with UK "1D/F.B." charge mark and 1d postage due cancelled LONDON 17 AP 28. (Ref 105629).
