Old Pound Coin With Nothing Either Side

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Hello and welcome.

First of all, we need to make sure it really is a "1 pound coin with both sides plain".

The main problem I see here, is that, a "1 pound coin with both sides plain" is just a plain brass disc; anyone with a machine shop can make a brass disc roughly the same size as a 1 pound coin. There would need to be some evidence that it was either (a) originally a 1 pound coin that has been worn or ground flat, or (b) that it was a 1 pound coin blank that escaped from the Mint.

So in order to offer anything beyond mere guessing, we would need to see (a) pictures of both sides plus the edge, and (b) a weight, in grams to 2 decimal places preferably. An XRF analysis of the alloy to compare it's composition with the alloy of old £1 coins would also help greatly, but XRF analysers aren't commonplace so that would probably be really difficult and expensive for you to obtain, so we'll rule that out for now.