This one is from 1966. S/N 4784xx The s/n on the butt is blurred out but its a 6 digit #.
I saw your ad today [2/10/15] and checked the sn in SCSW and it was bugging the heck out of me. "How could it have a 3 digit sn?"
So I decided to do a search and found your post. This is a great forum , you can learn something new everyday.