This cover is a very special item that was once a part of Franklin
Delano Roosevelt's personal stamp collection. Roosevelt was an
avid philatelist and much of his collection now resides at the
Smithsonian Institute's Postal Museum. However, part of his
collection was broken apart and sold at auction. This is one of
those auction items. The cover has been authenticated.
This is a postal stationary item (stamped envelope) - Scott #UC5.