Thanks Paul for the video. It looks still to me like the chord is formed as such:

E-0-
B-0-
G-4-
D-x-
A-4-
E-x-

A B7 chord slid up two frets, muting the Low E and F-note on the A-string.

Per Pauls doing, I encourage newcomers (and oldcomers) to visit the link he posted to see for yourself how Bill Broonzy formed it.

Then if you have a comment, let it fly. I'm still open to suggestions (mostly on how Bill forms the chord (i.e. playing it rightly), then how to name the chord in question).

Again, Pauls link re-posted for ease:
http://www.youtube.com/watch?v=N-pShRISHnQ#t=2m22s