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Is there a way to tell if its been plated?
Here are two methods, one destructive and one non-destructive:
1. Scratch or scrape it with a nail or a nail file to see the copper color underneath (and then the great color of zinc underneath that).
2.Go to your local university or big city museum and make friends with whoever runs their analytical department. There are several laboratory instruments which can determine the elemental components of the surface layer such as Energy Dispersive Spectroscopy. For a small fee, they might be willing to test your coin.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz