Mumon-ginsen coin has a diameter of approx. 3cm, and a thickness of approx. 2mm, with a weight of approx. 8-10g (It is equivalent to 6 shu [one ryo = 24 shu] which is one fourth of one ryo in the ancient times.)
直径約3センチメートル、厚さ約2ミリメートル、重さ約8-10グラム（古代の1両の1/4にあたる6銖に相当（1両＝24銖））。