Untouchable A 1928 Cadillac Armored car believed to have belonged to Al Capone is up for sale.

The 1928 Cadillac Series 341-A Towne sedan currently for sale may be one of the first armored cars ever built. More importantly, the car, which is said to have been owned by notorious Chicago mobster Al Capone, is available for purchase at CelebrityCars.com.

The story of the car seems to support the fact that it was indeed owned by Capone: according to a 1931 Milwaukee Sentinel article, the license plates belonged to May Capone, Al's wife. The complete ownership history of the car is known after 1933, which also suggests that the car was purchased from Emile Denemark. Emile Denemark owned the car as payment for debts incurred on the purchase of two Cadillac V-16s while the Mafia was in prison.

The car in question was powered by a 341 cubic-inch L-head V-8 that produced 90 horsepower. Cadillac built the first V-8 in the U.S. in 1914 and sold it until 1935. The car was also armored, which was important when the policy was that if your car was sent to the hospital, the other car would be sent to the morgue.

Sources indicate that Capone had the foundry install 1/4-inch boiler plates all around, including under the soft top, and thickened the windows. Hinges on the rear windows allowed passengers to shoot pursuers, and a police siren was added for traffic control. It was also painted green and black to match the police car Cadillacs of the time.

The car traveled to New York and then to England, where in the late 1950s a man named Harley Neilson purchased it and restored it, removing much of its original armor. 1971, the car was displayed at the Cars of the Greats Museum in Niagara Falls, Ontario, Canada, in 1971. It was also displayed at the Smoky Mountain Car Museum in Tennessee, and in 2006 became part of the collection of Texas collector John O'Quinn.

The vintage Cadillac sits on a 140-inch wheelbase and features a three-speed manual transmission, beam front axle, and a full floating rear axle with semi-elliptic leaf springs. Various restorations over the years have given it a much newer look, and in the video above, it is running on its own power.

CelebrityCars in Las Vegas is asking $1 million and requires a $20,000 deposit before the price can be negotiated.