The penny plachette would weigh weigh 3.1. Since it appears to be a different one it would weight different. It would weigh whatever that planchette normally weighs.
A dime weighs 2.5 grams +/- mint tolerance. A cent weighs 3.1 grams +/- .13 grams. Because a lot of the surface is worn down,that would explain the weight loss of a copper cent. John1
The surface is showing an acid bath. So the weight should be less than a silver dime if it were a dime. But The color should be correct for a dime or a cent. Which color is it?
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