Nice looking Smith's. The two with the diamond in the grips may not have a model number. Know the calibers which should be on the barrel. Check out the S&W forum, lots of info and folks that can tell you all about your guns. You may want to have the serial numbers ready as well, usually on the bottom of the grip. From what I know the longer barrel is a pre model 10 , 4 or 5 screws, the snubbies I cant really tell much, the flat latch gun will be a pre model, maybe a 36 or 37 if a 38. The one without a diamond should have a model number.