Steve McQueen’s Mustang from the film Bullitt hitting auction block

The Ford Mustang that Steve McQueen raced through San Francisco in Bullitt goes up for auction next month in Florida.

The car, an unrestored 1968 fastback in Highland Green, is expected to fetch as much as $5 million, becoming the most expensive Mustang ever sold, Bloomberg reported. But owner Sean Kiernan, in an unusual move for a vehicle of this caliber, isn’t setting a minimum price, meaning it also could go for much less.

Kiernan, whose father paid $3,500 for the car in 1974 and died before anyone knew its whereabouts, said he wanted to ensure the sale would go on the first try.