1999- or so says the Ruger website.
The Ruger website has sn data on it you can look at.
You will have to call Ruger to find out.
Ruger has sn data on their web site.
Ruger's website has sn data you can access
Ruger has sn data on their web site.
Ruger's web site has extensive sn data.
1960 according to the Ruger website.
If the Ruger website is up, it has sn data.
Ruger has sn information on their web site.
You will have to find the ATF data for that year. Ruger will not tell you.
Ruger website, customer service, historical data- year of production will be there by serial number.
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.