Little Paul Watkins deceased Charles Manson family member. Watkins testified against the family at trial.  He later formed the band Desert Sun with Brooks Poston and went on to write the book, "My Life with Charles Manson".  More can be read about Watkins on his Wikipedia page. 

Original mailing envelope completely handwritten by Watkins. 
The envelope is postmarked Jun 24, 1988 and hand signed, P. Watkins.

Paul Watkins June 1988 Envelope Signed