[kg4cna]

Originally Posted by Tom Bavis

It's in Sams folder 1083-3, from 1970. These usually came out shortly after the unit did, though some were much later. You may be able to find date codes on parts inside - electrolytic caps, transformers, speakers often have 'em.

Thanks Tom! I suspected it might be early seventies. I'll look around inside again when I pull the back off.