I would particularly like to see the sideplate removed, and good clear photos of both front and back (inside and outside).
The Toggle knob may not be cracked, it is hard to tell from the photos so far, I hope it is not. This is a very unusual specimen.
Here in this photo enlargement is why I suspect the cracked toggle knob.
I would strongly suggest that you get in touch with our member G.T. (Gerry Tomek) at gctomeks@msn.com . He lives in Chandler, AZ not far from you, and can give you an expert craftsman and gunsmith's evaluation of the condition of not only the toggle, but the entire gun.