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I made the stamper from moldable plastic. but a harder clay like FIMO should work. The stamper should be a harder material than the coins. Sculpey is a softer polymer clay is is better for the coins. It helps to rub the stamper with a rag and some oil to prevent sticking.
Once you stamp the coins, paint them before you bake the clay.
As you can see, the result is more realistic than what toy companies are making. And, you can make hundreds of these, while toy/gacha companies are not selling coins by the hundreds. LOL.
I needed a bunch of these for a pirate diorama, but they also looked good with skeletons.