Rear View of a 1884 De Dion Bouton et Trepardoux Dos-a-Dos Steam Runabout Rear View of a 1884 De Dion Bouton et Trepardoux Dos-a-Dos Steam Runabout. © RM Auctions Home » International » 2011 – Ten Most-Expensive Vintage & Classic Cars Sold at Auction » Rear View of a 1884 De Dion Bouton et Trepardoux Dos-a-Dos Steam Runabout