Tim - my original '69 is "rust" finish, just like the rest of the LCA. I assume this means it was originally natural, though I suspect it is some sort of high strength steel so could have been dark gray (like the gun blue finish). Sorry this is a little out of focus;
Here is an NOS one. The brace is heat treated and darker, spot welded to the lower arm. The lower bracket was rivited to the arm, it is stamped steel. Rivits dark also. A few out there restore these, it is alot of work.