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Okay, just did a quick search and the coins were definitely made before these talismans, dating back to BC. So, I wonder if the talismans that witches were making in the middle ages were influenced by the design of these pentagram coins... Or maybe something older that I haven't come across yet. There were some though that just looked so much like those old coins.
I do not know the answer to the question, but the concept of pentagram coins is interesting to me. I did a very quick search and found a lot of information; some good and some not-so-good in terms of the historical and cultural significance. Many of the images that I found were quite beautiful.