Documents signed by Abraham Lincoln go on sale at Sotheby's

On Wednesday, Sotheby’s will offer two unique lots, both bearing Abraham Lincoln’s signature, in a sale titled Two Centuries of American History: Highly Important Letters and Documents.
The auction features a copy of the Emancipation Proclamation—the important Civil War document that  “order[ed] and declare[d] that all persons held as slaves within said designated States and parts of States are and henceforward shall be free”—that was originally sold in