Bugatti under restoration, and down to the frame... it's still a thing of beauty

 Even the rims were marked. I sure don't know what this represents, if it's the vin, the size, or part number, but I find it interesting because I think it's one of those

to see it finished: http://justacarguy.blogspot.com/2013/10/the-bugatti-that-was-frame-and-engine.html