It was manufactured in 1961.
Ruger has sn data on their web site.
Ruger's website has a sn function.
1964
Made in 1950 but it's a Ruger Mark I.
Ruger's website has sn tables that will answer your question.
If the Ruger website is working, it has sn data on it.
Ruger's website has sn tables that will answer your question.
1965
50-200
Made in 1975.
Ruger will tell you if you phone customer service.
Not enough information to answer.My information which was found in ruger and his guns,indicates that this block of serial numbers was assigned to the ruger standard semi-automatic Mark-1 .22cal handgun in 1974.