I've had this guitar since the early 80's and this pick-up came with it. It is a humbucker with a split coil. Any information on this sucker would be great. It says "DUNCAN" on it but is it a Seymour Duncan?
I've seen a couple of sticker-bottoms that didn't have the initial, just the model, but never with the actual model name spelled out completely, just DD or DC or JB, etc.
Email those photos to the Custom Shop. MJ will look at it and let you know for sure and confirm what's been said here. Include the DC measurements as well.