Other items in the auction include Peggy's moving banker box, Joan Harris' office ice bucket and tumbler set, Harry Crane's AR coated eyeglasses, Bert Cooper's antique ashtray and Don's 1964 Chrysler Imperial that he used in episode 3 of season 4.
According to ScreenBid's notes, the convertible is one of only 922 ever built. It has power steering, brakes, windows and antenna, and features "the iconic 413 V-8 wedge engine mated to the smooth-shifting 727 TorqueFllite push button automatic transmission." The initial bids for most of the items will start at under $100.
[h/t: The Daily Beast]