Anyone know more abouit Mr Davis fro San Diego that was a

by Ken O'Neill, Thursday, December 24, 2015, 13:18 (3260 days ago) @ Rob Leahy

Rob, most likely you are talking about Bill Davis, who was a very highly rated custom gunsmith who operated several shops in California, one of which was in San Diego. He was perhaps best known for building custom PPC revolvers, and that was likely the desired end-use for the Cougar..
There is a chance your gun was built by Bain & Davis, who was also located in California, before it became Kalifornia, but I think it far more likely that Bill Davis was the Daddy. It should be a jewel.
Bring it to CSA!