This is an original cancelled check #000581 from Shelby American Inc in Los Angeles, California dated August 6, 1965 to California Telephone Answering Bureau for $15.00.  Signed by Peyton Cramer on front side whom was the Shelby General Manager and instrumental on negotiating the Hertz-Shelby sponsorship deal.  These checks are rare and are essentially self certifying due to unique ink stamps and punched holes required for bank processing back then.