A 1955 pre-model 10. Im not sure what the technical term is for such guns but its a 1955 (dated with serial numbers) and is not marked as a model 10. Love the gun, looks like its seen its fair share of days in the holster but its still able to hit almost anything. I thought having fixed sites was supposed to make a gun slightly less accurate, but this baby can still hold its own compared to my 19-5. Not a show piece but just a good alround working gun. It was my first revolver and made me a lifelong S&W fan.