Whatever you can get some one to pay for it wherever you are located. In Houston, I have seen less rare/valuable guns go for $1,500 and more valuable/rare guns go for $900.
Eroded forcing cone, flame cut top strap, late carry up and sloppy end shake or like new or somewhere in the middle? Also, if you want to interest collectors as opposed to shooters, are the external surfaces the way they left S&W or has some ya-who polished them bright?