Bumped into a traveler a little while ago who showed me what he said was a fragment of the actual Liberty Bell! Poppycock! The Liberty Bell is still intact and laying in the ruins of Philly. I have funded an expedition to that dump in hopes of having the entire bell brought back to my museum.”— Liberty Bell Expedition, Abraham Washington
Abraham Washington bumped into a traveler sometime in 2277 who showed him a fragment of what he claimed was the Liberty Bell. It was apparently still intact and laying in Philly's ruins. He began funding an expedition there in hopes of having it brought back in its entirety to be displayed at the Capitol Preservation Society.
The Liberty Bell is mentioned only in Fallout 3.