The Ruger website, under customer service, hostorical data, has a date of manufacture listing by serial number.
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
1966
50-350 usd
Ruger has extensive sn data on their web site, if it is up. Value could be 50-500 depending on specifics.
100-500 USD depending on specifics
Go to the Ruger website, customer service, historical data, select your model, look up serial number/year.
Average $200-$300. Spelled Sturm BTW.
Blue Book of Gun Values