Your gun dates to around 1970 and is a "Military and Police" revolver, which is a fixed sight K frame. You can determine the specific model by swinging open the cylinder and reading the model number that's stamped in the frame cut. It's either a Model 10-5 (standard barrel), 10-6 (heavy barrel), or a 12-2 (aluminum frame M&P Airweight).
Thank you for the info. The gun was my uncle,s who passed away. It is a10-5 there are some numbers also on the swing out cylinder is 60098. The barrel measures 5inches any idea on how much it is worth? Only been fired a few times and is in good condition. do appreciate your help .