Strange Duncan pickup. Any experts in here?

[chaosmonger]

Ok, I found this guy selling what according to him is a Duncan JB trembucker, but the cosmetics don't match what i have always had in mind when I think of a JB. First, the pole pieces on both rows are screws, then the base plate is black, and the logo is not the typical white painted one. Here there are pics of the P.U. in question:

http://i.ebayimg.com/00/s/MTU0OFgxNjAw/z/JnQAAOSwpDdVQUvO/$_57.JPG
http://i.ebayimg.com/00/s/OTI2WDE2MDA=/z/r~YAAOSweW5VQUvS/$_57.JPG
http://i.ebayimg.com/00/s/MTUwMlgxNTk5/z/UK8AAOSwqu9VQUvj/$_57.JPG

So, anyone know what am I in front of?
All I could gather about something similar was this:

http://www.premierguitar.com/articl...-announces-usa-model-humbucker-pickup-upgrade

So, any input?
THANKS IN ADVANCE!