This post shows Canadian philatelic commemoration of this historical event.
To commemorate the Penny Black's centennial, a slogan cancellation was produced for use at the Hamilton, Ontario post office on May 6, 1940.
|MAY 6TH 1940|
The Canadian Philatelic Society of Toronto used a meter commemorating the centenary of the first postage stamp
Canadian Philatelic Society, August 9, 1940