I just purchased a S&W mahogany case with blue felt lining. It's not a vintage original, but the 57 sure looks nice sitting in it after a good cleaning and polish.
I had a set of grips like that that sold for over $800.00 on one of the auction sites. I guess a couple of guys really wanted them. I haven't seen them sell that high since. You have a beautiful revolver. I hope you have a family member it can be passed on to later on.