Lincoln is posed standing by a chair and facing McClellan with other Union Army officers grouped outside a tent. From left to right: Colonel Delos B. Sacket, Captain George Monteith, Lieutenant Colonel Nelson B. Sweitzer, General George W. Morell, Colonel Alexander S. Webb [Chief of Staff, 5th Corps], General George B. McClellan, Scout Adams, Dr. Jonathan Letterman [Army Medical Director], unidentified soldier, President Abraham Lincoln, Colonel Henry J. Hunt, General Fitz-John Porter, Joseph C. G. Kennedy, Colonel Frederick T. Locke, General Andrew A. Humphreys, and Captain George Armstrong Custer.
Cool historical item. You should keep it.