The Chicago Bulls' original copy of Michael Jordan's $33 million contract -- the most valuable single-season contract in NBA history -- has hit the auction block.

The contract, which Jordan signed for the 1997-98 season, was his last with the Bulls. That season culminated in a sixth championship for Jordan and the Bulls. The contract is signed by Jordan, himself, and initialed by him on each of its 24 pages. It's also signed by Jerry Krause, former Bulls general manager, and Irwin Mandel, the man in charge of the Bulls' finances. It also includes a two-page cover letter from Mandel to the NBA.

The original estimate for the contract's value by the company auctioning it, Dallas-based Heritage Auctions, was $30,000, but with a week remaining until the bidding closes next Thursday night, bidding has already topped $28,000.