Unmarked Mystery Japanese electric guitar pickup 8.5K! 1960s-1970s

This pickup is a mystery to me, but probably someone out there recognizes it. I am assuming it is a vintage Japanese part but I suppose anything is possible. Tall black plastic cover, phillips head pole pieces, two magnets on the bottom. Reads over 8.5K ohms and I did hook it up to test also through an amp. The bottom plate was previously glued in place but glue has given out so you'll want to take care of that. Previous owner wrote 8kohms on the bottom. Pretty dusty. There is an extra ground wire twisted in with the leads that is not attached at either end. Shipping will be $6.50 in the US, $26 elsewhere. Thanks for looking!