I'm staring at a set of stacked humbuckers that came out of my '78 Jazz, wondering what the hell they are. They look like regular old fender pickups, except for the middle plate and stacked coil design. The plates are flat black and the only indentification is a white sticker with a black stamp on the bottom. The neck pickup says "IN-J" and the bridge "IB-S". Anybody have any idea? Thanks!