Thanks Larry, it's more a matter of aesthetics and decor than anything else. A bell isn't required on a boat this size, and is, in fact, no longer required on boats 40 to 65'. I have a couple of air horns, a Sea Sense Safety Blaster (great!), and a megaphone.
I'd love permanently mounted, automatic fog horn and bell, that looks "yachty," but I'm afraid I'd have to make my own. In this case I'd prefer a real bell with an electric clapper, and a real air-powered, very low frequency air horn, both with helm-actuated automatic controls. Just dreaming.
But yea, for now if someone wanted to sell me a 6" Perko chrome plated bronze bell at a bargain price....