NASHVILLE, Tenn. (CBS) — A rare piece of American history has set off a bidding war online.

An antique Robert E. Lee Tintype in a leatherette case was listed on ShopGoodwill.com and by Tuesday afternoon bidding had reached $15,000. The item is being held in Nashville, Tennessee.

Buyers have until 7:05 p.m. Wednesday to bid on this priceless artifact.