It is inscribed as 'OO国則宗' (Norimune in OO) (inside of OO illegible. In "Kyoho Meibutsucho" (Catalogue of famous things compiled in the Kyoho era), it is recorded as 'Bizen no kuni Norimune' (Norimune in Bizen Province)).
「○○国則宗」との銘がある（○内は判読不能。『享保名物牒』には「備前国則宗」と記されている）。