COMMENTS: Circa January 2007. Here is an early prototype of our 24F4. It's in near mint condition as it was only used for our R&D. Although it has spent most of its life in our storage closet, it does have one very small ding (not through finish) on the underside of the lower knee rest area (you might not have even found it if I didn't tell you). Push/pull pot on the Fat Stacks allows switching between single coil and humcancelling.