Standard of weight was a piece of silver, which is 43 monme (unit of weight), that is about 161 grams, but actually it ranged from 20 monme, that is about 75 grams, to 60 monme, that is about 225 grams, and it was used for trading after determinig the amount by weight.
量目（質量）は銀一枚すなわち四十三匁（約161グラム）を基準としたが、実際には20匁（約75グラム）から60匁（約225グラム）程度のものまで存在するなど不定であり、取引には天秤で量目を定めてから用いられた。