Wow! Thank you very much 30-30remchester, gyvel, and PetahW. I really appreciate the information.
Is it likely that S&W manufactured my gun in 1958 and had already named it the M-17, but did not stamp a model number in it anywhere? Based on the information in the prior thread I mentioned, I assumed it was made before 1957. Either way, I am glad I have the information you have provided. It is nice to know something about the gun.
PetahW, you are right. I took it to a range yesterday and shot 20 or so rounds through it. It was lots of fun! It's a good gun.