I can clearly see "POOL" on the edge of the disk. And based on the OPs stated dimensions, I would say that this very well could be the token from above.
rykroll - I truly hope, that if this turns out to be a coin or token, rather than a copper knock out, that the repeated naysayers issue you an apology. It would be thanks only to your shear determination and research in identifying this that an answer is reached, as clearly no one else was interested in going that extra step. Kudos sir.