My family has owned this gun for a while and I'm trying to get some details about it and even possibly some type of estimated value. From our research on the web it appears to be a 1858 model with serial number 20972. We're pretty sure the grips have been replaced, the serial number is stamped on the bottom of the barrel and also inside the grip. There is a W stamp on the right side of the frame that holds the cylinder and a R stamp on the bottom side of the barrel almost at the end of the barrel. Any information would be appreciated, see the attached pictures.