A Gatton Chord

This is from Danny Gatton's Telemaster! video.

E ---5---
B ---5---
G ---5---
D ---7---
A ---8---
E ---6--- 

Bass to treble, Bb F A C E A. But what is it? If you just take the high four, A C E A, and you got yourself an A minor. Add the F and you get an F major 7. But that Bb, in the root no less. What does it make it? Bb is the 4th. Normally people shove the 4th in high, not low.

But go play it. Give it a shot.