I doubt there are solid nickel parts. Pure nickel is nearly impossible to machine let alone form. Nickel silver or German silver is usually 12-18% nickel, the rest is copper, zinc and possibly some tin. I don't think nickel content can go over 22% under the best of circumstances.
http://en.wikipedia.org/wiki/Nickel_silver
http://en.wikipedia.org/wiki/Nickel_silver
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