Illegal Use of Savings Stamp for Postage
This is the image of a picture postcard that passed through the U.S. mails illegally in 1943. The reason for this is the use of a War Savings Stamp to pay the first class postage for the card. These savings stamps were supposed to be pasted into special books that could be exchanged for War Bonds, and were invalid for postage. Illegal usages can be quite fascinating for the collector.