Billionaire Warren Buffett's 2006 Cadillac draws $68,000 bid on first day of charity auction

The bids on Warren Buffett's 2006 Cadillac reached $68,000 on the first day of a charity auction that will run into next Thursday.

The online auction of Buffett's old DTS sedan started Wednesday at .

The 2006 Cadillac has only 20,310 miles on it, so Kelly Blue Book estimates that it's worth roughly $11,600. But Buffett's ownership and the fact that he signed the dash board makes it worth more.

The last time Buffett upgraded his car, the 2001 Lincoln drew $73,200 at auction — well above its book value of $11,200.

Buffett donated the car to one of his favorite charities, Girls Inc. of Omaha that offers educational and recreational programs for girls.