It has 4 screws on the starboard cover. It's a square-butt N frame, which I determined by fitting a Hogue Monogrip to it (yes, I have the original grips). Barrel is actually 2.5", not including the forcing cone.
After putting in a couple of hours cleaning it and touching up the bluing, it's a handsome piece. Can't wait to take it to the range this weekend.
Thanks for all the feedback. Sounds like I lucked into something good here.
"America is at that awkward stage.
It's too late to work within the system,
but too early to start shooting the bastards."