This stamp has a hidden date under the bridge on the left-hand side of the stamp.
In 1943 the Post Office Department issued new denominations of postage stamps to meet the amended rates of postage effective 1st April, 1943. The colour of the airmail special delivery service stamp remained the same; the denomination increased one cent as was the case with the 2-cent, 3-cent and 13-cent regular issue postage stamps and the 6-cent airmail stamp. This stamp is an innovation combining airmail and special delivery service charges in one stamp.
A Trans-Canada airplane in flight with an aerial view of what is believed to be Drummondville, Quebec. The design was chosen to emphasize the time saved in transporting by air, personnel and materials necessary for the speedy prosecution of the war effort.