One thing I overlooked - an anniversary edition without the signatures on the head crests!
http://www.adriancrawford.co.uk/porsche-information/911-info/carrera-3-2-and-911-turbo-3-3-1984-1989/carrera-3-2-body-shapes-details-specials/
Edit.....
Did not know the difference between the CE model and the Anniversary - seems that the anniversary has no signatures on the seats. My mistake!