LURP DOG,
Yup, It's "almost" possitively a 1969!!!!!
As for strings.....General rule of thumb is to subtract 4" for a recurve,and 3" for a longbow. Therefore,your 66" bow will need a 62" string. B-50 Dacron ONLY!!!!! The older production style bows are not FF compatable and they could damage the bow.
Go to the "Sponsors Classifieds" and check out "Bent Stick Bowstrings" Buy LeRoy Carlson (Goldenhawk) LeRoy makes very beautiful,Top Quality bowstrings at very reasonable prices. LeRoy had made strings for all of my old Bear bows.