By the way...Welcome to the forum!
I have limited knowledge about the early S&W's.
It appears to be a model One-and-a-Half New Model...2nd issue?
It has, what is called a "birdshead" butt. There are some other differences I'm not completely knowledgeable about. And no doubt...someone else will jump in here to straighten things out.
It looks to be in very nice shape.
Wait for someone else to jump in here. Hope you have a winner!
Stu
After reading glowe's response, I removed my incorrect update... He's right on the mark. I magnified the barrel picture and could see the dates better. I was right about several things...I have limited knowledge about these and no doubt, someone else will come along and straighten things out.
I guess it's better to say, "I know nothing and I can prove it"