In the early modern period, it was necessary in Europe because at that time coinage had an intrinsic value and even though a town was besieged commerce had to continue and soldiers had to be paid.
Not sure as to why the shape, might be ease of manufacture or somesuch.
Why that shape? What is siege money?
Money minted during a siege.
https://en.wikipedia.org/wiki/Siege_money
Not sure as to why the shape, might be ease of manufacture or somesuch.
For some reason I thought it was the besiegers that needed this