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I guess it's time to hunt through a krause that matches your planchet's weight and metal. Looks like nickel in the image - it's not silver.
The problem there is that Krause doesn't give weights for most non-precious-metal coins.
It's also entirely possible that it's not a coin blank at all, but a blank token, for use someplace that prefers not to advertise itself on its tokens. Let me give you an example.
The City Council here in Brisbane where I live manages several "waste transfer stations" - that's their euphemism for a landfill. City residents are allowed several trips to the dump per year for free, and access for them was (and still is) controlled by tokens - when you arrive at the gate they give you a token, which lets you leave without paying - everyone else has to have their vehicle weighed before and after, and pay for the difference in weight.
When the system was first introduced, the tokens were pretty, with the council logo on one side and text saying what the token was for on the other. A bit too pretty, perhaps, since they started losing them far faster than expected, and it was easy enough for a token pilferer to say "I lost my token at the tip face". So when Council had replacement tokens made, they looked pretty much like your "blank" there, with no design on them at all. I think the blank slugs have had a far lower rate of "disappearance".
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis