Herbert William Mullin early 1970's Santa Cruz, California serial killer serving life in prison for 13 murders he committed which he said were carried out to prevent earthquakes. 

Approximately 6" x 9" writing with cloud and quarter moon illustration on the bottom left. Mullin has broken down how long he has been alive by weeks, months, etc. 
Hand signed in full, Herbert William Mullin.

Herbert Mullin Autographed Numerological Writings