AROUND $325 to $375, depending on condition, whether it is Old model or New model, etc.
Average $200-$300. Spelled Sturm BTW.
Ruger's web site has extensive sn data.
1999- or so says the Ruger website.
Ruger has sn information on their web site.
If the Ruger web site will work for you, they have sn data available.
1975
If you mean a 10-22 than it's worth anywhere between 100$ to 450$ depending on the year it was made its condition etc.
1966
Serial number history can be found on Ruger's web site at: http://www.ruger.com/Firearms/PS-SerialNumberHistory.html As far as value, it greatly depends on it's condition, and features.
The Ruger website, under customer service, hostorical data, has a date of manufacture listing by serial number.
50-350 usd
Ruger has extensive sn data on their web site, if it is up. Value could be 50-500 depending on specifics.