OK, was having problems with the images the first time, but now i got em.....
i am not 100% sure the wire is/was used to connect the two coil halves together.
here are shots of the front of the humbucker and the backs of both of them.
you can see in the 2nd pic that there is a green wire going from screw to screw then just hangs off to the left. In the 3rd pic you can see that at some point the wire did go across the screws but is now broken.
I have looked at a lot of pics of humbuckers, but have never seen this. Any thoughts?