Rare President Abraham Lincoln Signed Civil War Autograph Signature. PSA Mint 9High Grade Lincoln signature from the first few months of his historic Presidency! Signed as President on July 26, 1861 just four months after being sworn into office, and three months after commencement of the Civil War. Lincoln writes in his own hand, "Respectfully referred to the Sec. of Navy A. Lincoln July 26, 1861" The signature has been graded Mint 9 by PSA DNA. Ships FedEx with signature required and insurance.