Depends on condition. Stevens are generally not high dollar guns, but there is modest collector interest. You will need a hands on appraisal.
You can't value anything with just a serial number. Who made it? What condition is it in? Is it a hand gun or a long gun?
Impossible to value a gun with no other information provided
50-400 usd
Dont know value but age is 1939
25-1000 usd
15-2500 USD depending on exactly what you have.
50- 500 usd
50-100 dollars
0-300 usd
15-125 usd
50-125 USD or so
Value of ANY firearm is based on EXACT make and model and condition- serial number does not tell us that. Value for the Ruger pistols can range from $100 to $350 or so.