This stamp has a hidden date in the middle of the stamp.
These two stamps feature two significant secondary industries of Canada. The 20-cent stamp replaced the 1952 issue of the same denomination. The 25-cent stamp is a new denomination; in fact, this is the first time that Canada has ever issued a 25-cent postage stamp. Apart from paying registration and postage charges, the 25-cent stamps may be used to prepay charges on overseas mail to certain destinations.
This stamp, illustrating a scene in a paper mill, pays tribute to Canada's largest single secondary industry. The pulp and paper industry leads all others for the value of product exported and wages paid.