Double tapped neutral se cable

I inspected a house built in 1974 yesterday. I opened the main electrical panel and saw that the ground wire coming from the grounding rod outside is double tapped with the neutral service entrance cable. I’ve never seen this type of installation before. It doesn’t look correct to me. Just wanted to get a second opinion if this is correct or if it should be reported as a hazard. Can the ground wire be double tapped with the neutral SE cable? Also was wondering if anybody knew how to verify the age of a square do you electrical panel?

No it is not correct, that terminal is not rated for two conductors and even if it were you would not put two dissimilar metals together like that. The bare GEC needs to be in it’s own terminal or under a screw on the neutral bar. Looks like it will fit.