Comment: Brian nailed it

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In reply to comment: Those are called German Silver (see in situ)

Brian nailed it

If the coin says ".999 pure fine Silver" and it isn't, that seller is in some doo-doo.

I saw another post that said something about weighing the metal. That's a good strategy for bars. Some sellers have been caught red handed filling gold bars with Tungsten because of how close the 2 metals weighed.

If you don't know your rights, you don't have any.