A lot of people talk about early bikes having brass or copper tags. well they are correct, early bikes tags are made out of copper or brass, then the are nickle plated, then paint is put into the low spots. anyways, I took this pic of what looks like a brass tag. , please click the picture then blow it up and see the nickle plating on the tag by the rivet. I think that the heat and years of use just make the plating come off. Hope this helps someone.
I finally got my liquid cooler in for the tig welder. here is the little box I made for it to sit in.