The Leake Auction Co. said the movie director, aviator and industrialist initially used the vehicle as his personal limousine, then completely redesigned and restructured it into a Boat Tail Speedster.
"This was a very unique vehicle, and it was a privilege to auction it in Tulsa," Richard Sevenoaks, president of Leake Auction Co., said in a statement Thursday.
"Howard Hughes was a very complex man and this car is a reflection of its unique creator. Our Tulsa show was outstanding, and it exceeded our expectations," Sevenoaks continued. "The auction kicked off on Friday with a large crowd and vigorous bidding. The excitement continued to build throughout the weekend, resulting in record attendance and enthusiastic bidders."