[mickmate]

No one wants to cut a piece of metal off an original chassis to test it and see if it's original alloy composition. You'd be lucky to find what the alloy composition was even if it was the same supplier and alloy. They are an old tube frame car that rusts from the inside out, you can tell if they're original or not. There are many other features to check for originality ahead of that. You can measure about any hole and check the wall thickness. That would tell you whether it was made of the original metal.