It's a Jazz Bass pickup except it's a split-coil humbucker and it's for your reissue mustang bass. Get it? A5 rod magnets, 42awg plain enamel wire, 7.6k, lacquer potted. Mounting screw spacing is 2". Cover is 2.35" wide at bottom, 1.73" wide at top.
A hum-canceling, split-coil design for that bass from that company which shall go unnamed. Two poles per string and two magnets per coil are a big improvement over the original design. 12k, 43awg coil wire.