It is very hard to read what numbers are inside when I move revolver to the left. There are 4 characters, the 3rd is very hard to read. There is no "mod" in front.
1084
The 3rd character does not look as clean as the other numbers.
Further details:
fixed site
4 screws - 1,2,3 and 5 as indicated by arrows on the id your gun
There is a strain screw in front of grip strap.