Keith Haring Signed Group. Black ink signed card stock drawing, gallery card and envelope drawn "Do not Bend" which was mailed to the Platts. Platts had a relationship with many artists and mailing was done from Haring to the Platts. Autographs & signed ephemera presented here is from the Cordelia Platt autograph collection. Highly regarded in the autograph industry, Cordelia was the president of the UACC (United autograph collectors club) and a well known dealer for many years. She was the authentication expert of Marilyn Monroe signatures . This is the last group of autographs presented by AAA.