AT-16.
Said it was beautiful wood, unique build along with one done with mahogany back some years ago.
His opinion was that it lacked the magic of the european maple wood, from Bill's archtop stash, and had less energy. Some who played it liked it, others who had played maple backed ones felt it was lacking.
No question, it is absolutely beautiful. Have my own piece of Collings Koa heaven to enjoy: