R2D2 Mailbox at Udvar Hazy
Also in the Space section of the Udvar Hazy, tucked away in a glass case next to the Space Shuttle Enterprise was this Star Wars mailbox. During the 30th anniversary of the Star Wars movie, the USPS issued a series of stamps and also painted a bunch of mailboxes to mark the anniversary.
This one is signed by George Lucas and the Postmaster General.