The document of kin-za (an organization in charge of casting and appraising of gold during the Edo period) at the time of Genroku Oban Reminting said they cast Oban by remitting 160 Hachiryoban, which is thought to be the Hachiryoban, and others.
金座の元禄大判吹替え当時の記録に八両判160枚その他を吹潰して大判を鋳造したとあり、これがその八両判であるとされる。