Personally, I have picked up a couple of blanks/planchets so I can say that "generic" ones are pretty common - made from solid metals such as stainless steel or brass, but bronze, copper, precious or sandwich metals (such as that of a US quarter with a copper trace running along the edge) are pretty uncommon and would very rare to encounter in tokens, simply because they're more expensive than "generic" metals. Tokens are rarely so important, but I happen to have a bi-metallic token. I also remember spending a nickel-plated steel token for ice cream at an IKEA here. Your silvery planchet looks to be intended for a US quarter, with the copper trace and all.
Another thing about tokens is that they are rarely milled along the edges, mostly to distinguish them from actual coins. In fact, all tokens I have have a smooth edge, if any improved edge at all. However I do have some playing cash that have milled edges.
Of the blanks/planchets I have none have milled edges, however a few have an upset rim, which coins usually have.