I am having trouble finding information on this and I lack the knowledge to know how feasible or not this would be.
I'd like to know how perfectly round coins could be made in the early middle ages. Where minting was done by hammering bullion to a plate of a certain thickness first, then cutting it in circles, and then hammering these circles with the stamp.
The outcome would be a circular coin I am sure, but you also often see coins from the middle ages, or earlier, that have a more fluid shape than a perfect circle. I find a lot of sources that go about the creation of coins and the process of minting them, but not much about the end result or how 'perfect' or standardized the result was. I know coins would be weighed and tested against scratches on a touchstone for metal content/makeup and such, but I again find not much about the circular shape.
The reason I ask this is that I have made a sort of coin keeper for a kingdom. It is basically a wooden shaft with two rounded caps, of which one can be taken off. The coins are stacked onto this stick by a hole in the middle of them, this would be a snug fit. The idea is that the rounded caps have a standard size which would be the one most coins would have. Making it easy/ easier to see if a coin has been clipped.