In 1665, the Japanese weight units were standardized, and thereafter, Shirobei GOTO and his descendants monopolized the right to produce counterweights used at an exchange house, and the production and use of other kinds of counterweights were prohibited strictly for the prevention of illegal exchange.
寛文5年（1665年）に度量衡の「衡」が統一され、両替商で用いられる分銅は後藤四郎兵衛家のみ製作が許され、これ以外のものの製作および使用は不正を防止するため厳禁とされた。