Hello Jackie,
I’m afraid I have to disagree with AI, this doesn’t appear to be a deliberate design and I doubt that it is a coin. As a detectorist, as well as obsessive collector, I have over the years found similar items, some are welding spatter and others the result of molten metal spill. A couple look like silver and are certainly white metal. The pitted surface is the side that landed on the ground, the other is the result of solidification, possibly with some crystallisation . My thoughts anyway.
Welcome to the forum, don’t be afraid to post your queries.
Jerry