Very cool. Berry must have used that amp on the At Fillmore East gigs, and his sound on that album is just killer- probably one of my favourite bass tones ever. Longtime Allmans roadie Joseph "Red Dog" Campbell passed away just this Monday so I assume he is the one referred to in the ad. I hope a charitable Allmans fan buys the amp to help Red Dog's family out and sends it back to Macon as the Foundation wishes.
This thread, and the news of Red Dog's passing, has gotten me to thinking about the ABB. I used to hang a bit with them, plus Jaimoe and Lamar are old friends and from my home town.