A matrix coin, which was a prototype of a coin, was made by using a hand-carved matrix coin, and mass production of homogeneous coins was made possible by the process of transcriptive molding from a carved matrix coin to a tin matrix coin, then to a copper matrix coin, and then to a coin in currency.
銭貨の原型である母銭は、手彫りにより製作された彫母銭を原型とし、彫母銭→錫母銭→銅母銭→通用銭という順で鋳写される工程が採られ、均質な銭貨が大量生産されるようになった。