I had contact with the eBAY seller before the auction ended. This was his response:
"It used to be Midnight Blue Pearl, which eventually discolored and became Midnight Liver. I took the kit to the late LA drum maker Paul Bleifuss, who removed the finish and buffed the wood below. I find this natural color and wood grain to be very attractive. I glad you asked and I should have mentioned this on the description. Dang. I'll see if I can edit my entry."