Unsigned attributed to NARA-school
Round Rectangular shape, Brass ground, Stone surface, Takabori, Kebori, Stamp carving, Shakudo, Yamagane, Gold inlay, Shakudo Fukurin rim, Both Hitsu-ana punches
71.4mm x 66.5mm 5.2mm thick (Mimi) / 4.8mm thick (Seppa-dai)
NBTHK(Hozon) certificate/NBTHK(Tokubetsu Kicho) certificate