You will have to call Ruger to find out.
Call Ruger and they will tell you.
See the related link at the bottom
Ruger's website has a sn fucntion that allows you to find out when a firearm was made.
You rifle appears to have been manufactured in 1983.
If the Ruger site is up, it has sn data.
100-400 USD
Ruger has sn information on their web site.
Ruger website, under customer service, historical data, lists year of manufacture by serial number for different Ruger models.
Ruger's web site has sn data.
40-400 usd
You will need to contact Ruger Customer service (use the Ruger Website) and they may be able to find that for you. It has only been in production for one year back then.
You can look up the serial number on Ruger's website.