Went on a bit of a deep dive (i.e. watched some YouTube videos).
Ok jokes aside, what a very interesting topic.
Best video I found so far is about 8 months old. It’s related to a researcher’s PHD. https://m.youtube.com/watch?v=GSIJIOfpK08
She did some comparative experiments and definitely adds to the general knowledge base.
(There’s a 2007/2008 French experiment video that basically didn’t prove anything they hypothesized and was quoted a few times. I’m disregarding it because of the inclusive results and what looks like lack of follow up.)
The main issue is that there really isn’t a ton of historical knowledge of how money was minted thousands of years ago. Turns out that people back back back in the day valued the knowledge of how coins were minted to the extent that there is almost no archaeological evidence.
It’s a really interesting topic that even in 2021 has a huge amount of room for research.