Other than copper coins, there are silver coins called 'Bansen,' which have Chinese characters to express numbers incused on the back, and they are said to have been minted by Mito City.
銅銭の他に、背に漢数字を鋳込んだ「番銭」と呼ばれる銀銭が存在し、これは水戸市の鋳造ともいわれる。