Old guitar pickup GIFMEN vintage rare treasure Pacifica

This was attached to a guitar that has been in my possession for nearly 30 years. It produced sound back then.

I have information that it is a Taiwanese manufacturer.
It seems to have been previously attached to a Yamaha Pacifica, so it appears to be a pickup with some recognition.

The magnet is rusted.
It may have had a cover, but it is missing. There is white dirt on the side.

I do not know if it can be used by rewiring it, so please consider purchasing only if you are able to repair it yourself.

Please be sure to ask any questions before purchasing.