Even though the Dynasonic has been reproduced and offered at, perhaps, 30% of the peak value of the originals, the originals still seem to be holding a pretty good value. Notice this one that is missing the frame, the badge and the original wrap sold for just over $600.
I think this price was high because someone wants to match one to their set without having to wrestle with conscience over the idea of stripping one of its original wrap. Just a guess. Good deal for the seller!