One of the last documents ever signed by Abraham Lincoln, which for years lay undiscovered in a desk drawer, is being offered for sale, valued at $45,000. The 16th president signed the document, a treasury appointment for Allen Gangewer, an anti-slavery campaigner in Pennsylvania, Ohio and Washington DC, on 11 April 1865 – the day he made what would turn out to be his final speech. Three days later, at Ford’s Theatre in downtown Washington, Lincoln was shot by John Wilkes Booth and died the following day. “A woman from the midwest, probably in her 80s, gave us a ring...