The 2 big 'circles' are in a unique position on the CJ compared to the long H&C. Ive learned to use that.
The more perfectly formed inserts are also a trait of older Burt Co chips from the CJ era.

I realise people will probably jump in and say 'Book says 1975', they could be Paul-Son.
Well, they could be, could well be a Paul-Son order through CJ. Still made at Burt and still made on the CJ mold before PS had their own.
Paul-Son sold more CJ chips than CJ ever did themselves