Ruger has sn information on their web site.
You rifle appears to have been manufactured in 1983.
You will have to call Ruger to find out.
1968 - 1988.
Ruger's web site has sn data.
Ruger's web site has sn data.
Call Ruger and they will tell you.
Ruger's web site has sn data.
Ruger's website has a sn look up area.
1970
Ruger's website has extensive sn data for all to access.
See the related link at the bottom