Welcome to the forums from the Wiregrass, Jgirard and Cyclonegt! Absalom has identified Jgirard's friend's .38 M&P. Only thing I can add is the grips are not original and look homemade. They also are much better for shooting than the grips it came with originally.
Cyclonegt, it would have been better for you to start a new thread so folks wouldn't miss your post. That being said, I have to be the bearer of bad news. Your Model 1917, .45 ACP Double Action was likely made in 1917. And, yes, it is an N frame. The bad news is the gun is not legal because someone ground off the official frame serial number on the butt. That was likely done when the lanyard hole was filled and the gun plated in nickel. It was probably done before 1968 when it would have been legal, but the Gun Control Act of 1968 makes removing or defacing a serial number illegal and it is retroactive back to 1899. Guns made before 1899 are antiques and not considered firearms by the BATFE. Sorry.