(FoxNews) – Sean Kiernan may get as much as $4 million for a piece of 
Hollywood history that his father, Bob, acquired for just $3,500 and
refused to sell to Steve McQueen, the actor who drove it in the 1968
action film "Bullitt."

When the classic-car insurer Hagerty sent car expert Kevin Marti to
authenticate the vehicle, he couldn’t believe his eyes, according to a 
New York Times report: “Ninety-eight percent of the original car is
there,” Marti told Hagerty. “It’s an incredible artifact.”

Since ‘Bullitt’s’ release, the 1968 Highland Green Mustang has become
one of the best-known vehicles shown on the big screen. McQueen
himself even tracked down Bob Kiernan in 1977 and wrote him a letter
asking to buy the muscle car back, according to the Times.

“I would like very much to keep it in the family, in its original condition
as it was used in the film, rather than have it restored, which is simply
personal with me," McQueen wrote in the missive detailed by the Times
which reported that Bob Kiernan never wrote McQueen back.

Sean Kiernan of Nashville stands next to the Ford Mustang GT 390
driven by Steve McQueen in the cult classic film "Bullitt."

Steve McQueen, starring in the title role of "Bullitt," steps out of his
car after a pursuit through the hilly streets of San Francisco.

On January 4, 1965, in his State of the Union address, President Lyndon
Baines Johnson lays out for Congress a laundry list of legislation needed
to achieve his plan for a Great Society. On the heels of John F. Kennedy’s
tragic death, Americans had elected Johnson, his vice president, to the
presidency by the largest popular vote in the nation’s history. Johnson
used this mandate to push for improvements he believed would better
Americans’ quality of life.

Following Johnson’s lead, Congress enacted sweeping legislation in the
areas of civil rights, health care, education and the environment. The 1965
State of the Union address heralded the creation of Medicare/Medicaid,
Head Start, the Voting Rights Act, the Civil Rights Act, the Department of
Housing and Urban Development and the White House Conference on
Natural Beauty. Johnson also signed the National Foundation of the Arts
and Humanities Act, out of which emerged the National Endowment for
the Arts and the National Endowment for the Humanities.