I've never seen a DASS BB24, but I wouldn't be surprised if 1 or 2 were made. The 2008 Ryder Cup model is probably the closest I've seen to it. You might ask Nick or Jimmy to hunt through Bob Bettinardi's private collection, and then beg him on your behalf if they find one.
The BB24 is a beautiful model, but I haven't focused much attention on it, because I rely on a flange site line (parallel to the target line) when putting. Some BB24 putters have a flange site parallel to the face, or a site line on the topline.
Good luck in your search.