Among them, Sekishu silver coin (Soma Silver) (from Sama), which was made of silver produced in Iwami silver mine, was in high quality and abundant; however, the quality in general was inconsistent according to mines, causing quite inconvenience in trade.
中でも石見銀山産出の銀で作られた、石州銀（ソーマ銀）（佐摩）は良質で量的にも潤沢であったが、銀産地による品位のバラつきは取引上甚だ不便なものであった。