1941 Packard Clipper, used to carry J. Robert Oppenheimer and others of the Manhattan Project.
"This original 1941 Packard Clipper transported physicists, senior officers, and dignitaries from the train station to Los Alamos ... and to the Trinity base camp for the testing of the first atomic bomb. In 2005, this limo was discovered in a Gallup, New Mexico salvage yard ... and restored in time for the Museum's Grand Opening in 2009."
The car today at the National Museum of Nuclear Science & History