1940 Federal Duck Stamp |
Snippet of Article: "...An oft overlooked collectible stamp is the Federal Duck Stamp. The Federal Migratory Bird Hunting and Conservation Stamps, often known as “Ducks Stamps,” are pictorial stamps produced by the Postal Service for the U.S. Fish & Wildlife Service. These stamps are not valid for postage. Originally, these stamps were created in 1934 as the federal licenses required for duck hunting and hunting migratory waterfowl.
In addition to serving as a hunting license and a conservation tool, the Federal Duck Stamp ..."
Source: Collecting Federal Duck Stamps