Cardboard signs were widely used in the 20th century to advertise everything from beer and soda pop to patent medicines and cigars. The material was especially popular for signage during World War II, when the heavy metal used in porcelain signs and the lighter tin used in lithographed signs were rationed for the war effort. Even before the war, the appeal of cardboard was obvious. Cardboard signs were cheap to produce and easy to put up....Continue Reading