51 P bass pickup ID help?

I just got an MIJ '51 P bass reissue that has a replacement pickup in there. The seller wasn't sure what it was. I was wondering if anyone here could help identify it?

It's definitely dual coil - it has a push/pull pot for coil tap. It's got the 4 connecting wires - black, white, green, and red. That makes me think Seymour Duncan, but I'm not sure if that's a common color scheme for other manufacturers. And also the pole pieces are thicker than usual, which made me first think it's a SD Quarter Pounder. However as far as I can tell, the QP is single coil only. No other markings on there, top or bottom. It does not have string wrapped around the outside like other vintage style pickups.

Let me know if there's any other info/measurements/etc. I can provide to make it easier. As always, thanks for the help!