1929 Edison Commemoratives
These stamps were issued to commemorate the 50th anniversary of the first incandescent electric light, invented by Thomas Edison. Because of the Post Office policy never to portray a living person on a United States stamp, Edison’s picture could not be shown on the stamps that honored him.
U.S. #656 was the third stamp issued with this design, produced for use in vending machines. This was the first time a commemorative stamp was issued in coil format.