Cost of a postage stamp was dependant on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States 1956 that was 3 cents for the first ounce.
On US stamps, Abbott and Costello appeared on a 1991 issue. There were probably foreign stamps picturing movies stars before that.
First class postage was 3 cents for the first ounce in 1956. A post card cost 2 cents.
April in Portugal - 1956 was released on: USA: 20 April 1956
A First Class postage stamp cost 3 cents in 1946.
April 15th, 1956 fell on a Sunday.
April 25, 1956, was a Wednesday.
April 13, 1956 was a Friday.
In 1934 the price of a first class stamp was 3 cents. A postcard cost 1 cent.
April 19, 1956 was a Thursday.
April 14, 1956 was a Saturday.
April 2, 1956 fell on a Monday.
April 22, 1956 fell on a Sunday.