Error? Blank Coin?

Is it the same thickness as a normal quarter. What is its weight? If it is thinner than an quarter and under weight, I'm thinking it is a coin that was polished to remove the cladding and now is just showing the copper core. The reeding tells me that it was a normal coin that was struck and now the upsetting is removed, the cladding and all evidence of the devices were removed.

It def was never struck. The surface dosent show anything, even under a loop. Its the same thickness as a quarter. Idk the weight. Ill weigh it when I get a chance

I have seen slugs WITH reeded edges. (Completely blank copper slugs with reeded edges.) Exactly why they ere made that way I don't know. My only guess was to pass them in rolls. They would probably work in vending machines as well but there would be no reason to give them the reeded edge in that case. And these were seen back in the years before video games came out so tat wouldn't be what they were for. (Although they would work in them.)