The Ruger website posts that information, under 'Product History'. See related link at the bottom.
Ruger has sn data on their web site.
Ruger's website has a sn function.
If the Ruger website is working, it has sn data on it.
1964
1965
It was manufactured in 1961.
Ruger will tell you if you phone customer service.
$100-$250, depending on condition.
Contact Sturm/Ruger and ask for an archive check. Sometimes a small fee is involved.
Ruger's website has extensive sn data. 75-175 or so
Magazine
No such Ruger ever made