My friend Jay is a police officer in our nation's capital and was recently assigned to watch over the Deringer that killed President Lincoln. I can only imagine how it feels to hold a piece of such a small size but of an immense weight.
Digging around the web, I found an interesting article on whether this weapon had been stolen from the Ford's Theatre National Historic Site and replaced with a reproduction... FBI Case File, The Booth Deringer—Genuine Artifact or Replica?. (The bullet that altered history is displayed separately at the National Museum of Health and Medicine, Walter Reed Army Medical Center.)
Henry Deringer bio.