That is the correct spelling of Ruger, which is named for William Ruger of Sturm, Ruger & Company.
Sturm, Ruger was founded in 1948 by William Batterman Ruger with a $50,000 stake from Alexander Sturm, a family friend and gun collector.
Its a pistol. More specifically a 6-shot, single-action revolver, made by Sturm Ruger and Company.
Sturm was the name of one of the founders of Strum, Ruger and Co.
RGR
The company Sturm, Ruger & Co was first set up in 1949, when it first began selling its rifles. Since then, it has enjoyed wide success for its popular rifles.
RGR
The NYSE stock symbol for Sturm, Ruger, and Co. is RGR.
Ruger's website has extensive sn data.
100-300 or so
Average $200-$300. Spelled Sturm BTW.
You can look up the serial number on ruger's website