Not English Brown Turkey, not flat bottom. Not Southern BT, wrong leaf. Really looks like a Celeste variant to me. a picture of the eye would help to determine if it is a Southern BT. If it grows good, tastes good, who cares.
Maui has some really great farm products and most are larger than those on the mainland. The Pineapples, avocados, onions were the best, and largest I had ever seen. I lived in Pukalani, Maui for 2+ years.