Before a packed house, the 127-year-old ride quickly eclipsed its $500,000 starting bid.
By the time the dust had settled, the gavel fell at $4.2 million. The final price included a ten-percent buyer's premium. The crowd began applauding as soon as the car crept onto the stage and the enthusiasm didn't wane until well after the sale.
The Runabout had been in the same family for 81 years prior to the sale, and is one of six De Dion tricycles known to still exist. A total of 20 of the three-wheelers were built. When new, the trike had a top speed of 62 km/h and a range of 32 km on one tank of water. The vehicle that sold last night was the only car to show up for the world's first auto race, where it averaged 25 km/h over a 32-km course.