Many thanks for your message. A wonderful piece of history you own.
I found this on the web regarding Burrell and his Gibson guitars:
"The Gibson Super 400 has been your trademark guitar for many years. When did you first begin playing one, and what attracted you?
It was probably in the late 1960s. I’d been using a D’Angelico New Yorker, which was the same size as a Super 400 (18″ body). I like that body size – and where my elbow rests. What I like about the Super 400 (CES) is the humbucking pickup. I originally used the Charlie Christian bar pickup; that’s what I had in my L-5 and L-7 guitars [in the late ’50s/early ’60s]. But the humbuckers had no noise and worked better, especially when I had to turn up the volume with people like Jimmy Smith. They are more “utilitarian,” if you will. I prefer the Super 400 model with two humbuckers and a Florentine cutaway. With that cutaway, I can get my whole hand up there."