You will have to call Ruger to find out.
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.
Go to the Ruger website, customer service, historical data, revolver, find your model, and there is a serial number/ year of production list.With the serial number that you provided,your ruger single six was made by ruger in 1982.
The Ruger website has sn data on it you can look at.
Ruger has sn data on their web site.
If you find the serial number of YOUR Ruger, go to the Ruger Website. Under Customer Service you will find a link to historical data. You can look up the year of manufacture by serial number. Since you did not share with us what your serial number is, we don't have a clue.
Ruger has sn data on their web site.
If the Ruger website is up, it has sn data.
You will have to find the ATF data for that year. Ruger will not tell you.
Go to the Ruger website, under customer service, historical data, rifles, select your model, find serial number, and it will show year of manufacture.
Ruger has sn data on their web site. 1981