Value of any firearm is based on make, model and condition. You gave us a make. We have no idea if you are speaking of a rifle, shotgun, handgun or machine gun. The serial number on its own imparts no information. Post a question with a complete description, and we can give you some idea of value. Start with everything that is written on the gun.
50-175 or so
50-200 USD
20-200 USD or so
Average $200-$300. Spelled Sturm BTW.
50-500 USD depending on specifics
Value is dependent on model and condition, and could not be answered without detailed information you have not provided. for date of manufacture, contact customer service at Ruger. http:/www.ruger-firearms.com
100-375 USD
500 or so
50-125
500 USD each
A call to Ruger will get you the answer.
If you mean a Sturm Ruger, about 300 USD