I have a S&W revolver, 6" barrel, M&P 38. Serial #S973183, 38 special. When the cylinder is dropped down you can see this #,59907 with a J above that. 3 screws on right side. 1 screw in front of trigger gaurd. 1 screw in front gripstrap. Did not take grips off to check for screws. If anyone knows date of manufacture it would be appreciated. Thanks