unsigned attrributed to SHINGEN
Triple layers Iron ground hammered surface, Round shape, Brass/Shakudo copper wire knitting, Rope pattern brass Fukurin rim, Both Hitsu-ana punches brass Fukurin-rim filled with lead
85.3mm x 85.3mm 5.0mm thick (Mimi) / 5.0mm thick (Seppa-dai) 6.5mm thick (overall)
NBTHK(Tokubetus Hozon) certificate