(Adds auction results) By Marice Richter DALLAS, Jan 24 (Reuters) - A lock of slain U.S. President Abraham Lincoln's hair and items connected to his assassin were top sellers on Saturday at an auction that fetched $803,889 in the sale of a top private collection of Lincoln memorabilia. Fetching $25,000 was the lock of hair removed by Surgeon General Joseph Barnes shortly after Lincoln was shot by actor and Confederacy supporter John Wilkes Booth on April 14, 1865.