One of the teenagers at my church asked me to see if I could find out anything about a revolver his grandfather left to him. The story he was told that it was used in a bank robbery. The guy was convicted but before he gave the gun to this kids grandfather and asked him to keep it for him till he got out. The guy died while in prison. The marking on above the hinge is 77171 the serial # is 5910xx. Does anyone know anything about what model this is and approximate worth. He also said he has the original wood grips for it but his grandfather put the plastic stag grips on it.