12cm unit for Pioneer mids. Details are unknown, but it looks like the 70s, FB cone era. The edges are made of cloth. There is a line scratch on the center cap on one side and a repair mark on the cone (Murakoshi Yoichi)
Maintenance information: 2022.10.22 sound output confirmed
Accessories: none
Main specifications: frame diameter 142 mm screw pitch (diagonal) 135 mm depth 94 mm 1.4 kg