Hi, I sent this earlier but it must have gotten lost in space.
Visit http://mjsa.polygon.net click then click
infosource, you will then be at a directory of all sorts of info
nickel being one. AGTA is at http://agta.polygon.net tradelocked
site. The phone is 1-800-972-1162 And if you haven’t figured this
out already http://polygon.net has many jewelry related sites.