They are 35% silver. You can tell by the patina. They look nothing like regular nickels. You'd have to get these...
You definitely want to weigh your 83's. I agree with that. Usually I can tell if they are zinc without weighing. But sometimes it's hard to tell.
I have a couple of gold plated South Dakota quarters that I kept, cause they look cool. Even though your plated quarter is only worth a quarter...
They are never worth grading.
Most likely your scale rounded off 2.5 to 3. Generally, the copper coins are copper colored. (Brown) And the zinc coins which have a copper...
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