1939 30c airmail to Belgium, stamp dealer.

1939 Montreal roller (Nov 23 1939) ties 6c air, 10c Mountie, 20c Niagara Falls on AH VIncent stamp dealer cc cover to Brussels, Belgium, paying 30c airmail rate (overpaid).Censor tape (partially removed on face, but on reverse intact with “Examined by Cnesor C.18”.