Welcome to the forum.
I am far from an expert, but will try to narrow things down a bit.
All of this is assuming your revolver is chambered in .38 Special, though I cannot read the caliber designation on the barrel.
You appear to have a .38 Military & Police revolver, the predecessor to the Model 10.
If the quick Googling I did has yielded accurate results, it is pre-war. The serial number puts it at about 200,000 units past my own that shipped in 1920. It is well into the "heat treated cylinder" era.
My understanding is that the star marking indicates that it has been sent back to Smith and Wesson for some kind of work at some point in its life.
I know this is vague, but it's what I have gleaned from looking into the one I have.
I had narrowed mine down to the early '20s, but then posted it
here.
On this site, up at the
top of this section is a similar reference.
There are folks on both sites that really know their stuff, and will get you more specific information.
Enjoy that piece, it's a classic.