I submitted the photos of the axle limiting cable with the single crimp copper ferrule and taken from 6S299.
After reading the following discussion and studying my saved cable, it appears the cable ends were soldered or melted together. No cable frays exist.
As said before, I had assumed the ferrule was aluminum until one day I notice what looked like a tinge of copper. Using some steel wool, I confirmed it was indeed copper.
While it is possible the ferrule could have had a protective coating covering the copper, it doesn't appear to be the case. Simply tarnished copper and road debris is what appears to me.
I always assumed the cables were original since I removed them in 1999 and knew the car history from the 70's. Still, I respect what Bob Gaines says about necessary proof. I saved what I thought was important at the time, removed the cables from the context of things. Now, I can only offer what might contribute to solving a puzzle.
It will interesting to learn more from others.
Gary C. Bergman