There are only two of the Bugatti Atalantic type 57SC, one at the Mullin Museum (highest price ever paid for a car), one in the Ralph Lauren collection.. but even cars this expensive have been in the classifieds

 above from my post 2 years ago http://justacarguy.blogspot.com/2010/01/some-amazing-things-turned-up-in.html

Bottom image from http://karamelocycles.blogspot.com/2011/06/bugatti-type-57s-atlante-1937.html

3 were made, one was hit by a train in 1950. So one of the above was the car in the calssifieds.