I was going to say, a flat object (out of wood or metal for 'genuine-ness') would be a lot more practical, and they'd be using them everywhere.
In western Europe, they would use scales to determine the weight of coin, since size itself doesn't mean much - that's logic used by modern day vending machines.
In western Europe, they would use scales to determine the weight of coin, since size itself doesn't mean much - that's logic used by modern day vending machines.