another 1983 us cent overpolished

With all the neat coins you have, I can't believe you don't have a scale. Take a wooden stick (popsicle stick) balance it in the middle and put a known zinc plated on one end and this on the other. If it tilts to this quickly, I would get a scale real fast
You see there are a few copper 83 cents out there $$$$ so I've heard

 

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Pick up a scale on ebay for under $15.00 shipped free. I did and it works like a charm, an excellent investment for looking at the 1983's.