Is it just the lighting or is that a copper plating flaking off of a zinc core on the reverse pic? Also it looks like something had been tooled off below that center of the memorial. Perhaps the word "copy"?
Looks like a zincoins with the surface bubbles. If you are going to weigh a coin, you need an accurate scale to at least 2 decimal points. Saying it is over 3g is not accurate enough.
The penny had something on it on both sides. I ran it under hot water to get it off. Some still remains on last a in America. Everything under it was shiny
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