50-1000 USD or so depending on specifics
You need to contact Ruger. You may have a prototype
Ruger has extensive serial number data on their website.
You can find serial number data on Ruger's web site
Ruger's website has extensive serial number data for all to look up.
Ruger has extensive sn data on their website.
Impossible to answer without the serial number. You can, however, call Ruger or visit their webiste and find out.
If the Ruger website is up, the sn data you seek is there.
Call Ruger and they will tell you when it left the factory.
Ruger has a sn function on their web site.
Ruger has extensive sn data on their website.
Ruger has sn data on its website.
A call to Ruger will get you the date it was made