Hino Audio 13cm woofer. It consists of a cloth center cap and edge on a cone that seems to be poly. There is a dent mark on the edge on one side (Murakoshi Yoichi)
Maintenance information: 2022.12.17 sound output confirmed
Accessories: specification sheet, original box
Main specifications: 4Ω minimum resonance frequency 95Hz 86dB 30W mounting hole position 134mm