Moreover, Mumon-ginsen coin is known as the older coin than Fuhonsen coin, and it is considered as Hyodo kahei (currency valued by weight) for barter exchange by the value of silver as raw metal.
更に富本銭よりもさらに前の貨幣として無文銀銭が知られているが、これは銀の地金的な価値が認められて物々交換的に使われた秤量貨幣と考えられている。