Hi Kenn, Pace,
I don't know it was original or not in the omega.
The bass was made as 5 strings SSB, but it converted to 4 strings, and 8 strings.
I can only say another strap button was located at the neck heel.
the back shot is here.
It has no battery cavity.
I think the button in the omega is better effect for the balance, especially for 8 tuners.
My 77' 5 strings LSG Omega has 2 buttons on each side.
Eiji