You are looking at a Colt Detective Special, or possibly a
factory 2" Police Positive, but also could be a shortened
Police Positive. Dates to 32-33.
A factory Fitz would have a bobbed hammer.
Condition is fair. Check function and lock-up.
If you can get a clear picture of the barrel markings it will
be much easier to determine what it is. Or write them down.
My guess is a cut down police positive.
If it is and function is good, I would call it a $300 shooter,max.