I agree, it should be a Number 1, 1st issue, 4th type. If you look in the SCSW4 you may be shocked by the value's assigned to these. only guessing at the condition level, not knowing the mechanical situation, I'm guessing the condition might rate "good" which has a value of $900, If mechanically operational might stretch up to a Very Good, $1400. Keep in mind these are collector values, and there are limited number of collectors interested in these vintage pieces.
Unless you are very accomplished with gunsmithing of these vintage S&W I would advise on you not attempting to do anything to it, they are very easy to "break worse" and there are literally no parts available for them.