Richard do you mean that only wood was used in early models? In looking in 70's-80's stick thread this 73 on Ebay doesn't have wood. EDIT: dead link deleted here
I'm not to sure if this is what I'm looking for, but it's getting closer.
Oddly enough I looked at a 73sl about a year ago that was also a manual that didn't have wood. This site deemed it to be a gray market and advised me to stay clear of it. Maybe none wood was only in Euro models.??

sparky