Calling all geeks

Back in the late 60s a local bank was giving away key chains. Pretty ordinary with a big "gold" oval fob with the banks logo on it (It may have been Lincoln Savings & Loan).

I happened to discover something interesting about the fob. It was *para*magnetic. That is, it was attracted by magnets, but only weakly. Very strange.

Whatever the fob was made of it was solid, not plated (I used a file on one edge). It got lost many years ago but I've always wondered just *what* that alloy was.

I'm hoping one of my fellow geeks might know.

Blitzkreig!
(tanks in advance :-)