July 8 is National Collector'* Car day, and to celebrate, eBay Motors is hosting an auction that should break the site'* record for the most expensive vehicle ever sold through the site. One of the nine remaining General Motors Futurliners is set to fetch millions of dollars from June 8-18. This particular example has been meticulously restored by Peter Pan Bus Lines over a total of three years. The 400-horsepower leviathan is 33 feet long and just shy of 12 feet tall. When it was built for the 1939 New York World'* Fair, it cost GM around U.*. $2 million in today'* dollars. (Those of you with long memories may recall that a similar example shattered Barrett-Jackson records when it hammered at U.*. $4.1M in 2006).

After the World'* Fair, the 12 Futurliners toured the U.*. under the "Parade of Progress" banner, showing the nation the technology of, well, the future. Each bus opened up to display the science behind microwaves, jet propulsion and the like. This particular example was exhumed from a New York corn field in 1997 before being massaged back to life by Coach Builders of Springfield, Massachusetts.

The bidding starts tonight at 9 p.m. Eastern, but for now, you can head over to eBay Motors to learn more.