It is definitely not an N Frame gun. It has the wide rib and the barrel is cylindrical, not tapered, as the N Frames in .38/.357. No matter how you do it you cannot make a tapered barrel like a 27, 28, or Outdoorsman into a straight-sided bull barrel. My money is that it is one of the .38 Special Model 19s that were made as mentioned above. Except for the extractor housing it strongly resembles the Dayton guns. The front sight and extractor housing are not correct to be a Dayton or else that would have been my first choice.