The numbers 10-21133 are the serial number that was assigned to your Ruger Standard Mark I pistol,which was made in the year 1969.
Ruger website, customer service, historical data- and you need the MODEL of the pistol. Your serial number indicates that your Ruger pistol was made in the year 1976.The ending serial number for that year was 13-48646.
Ruger has extensive sn data on their website.
by serial number
Ruger has a sn function on their web site.
The Ruger .22 Long Rifle pistol, commonly known as the Ruger Standard or Ruger Mark series, was first introduced in 1949. The specific year of manufacture for a particular serial number can be determined by consulting Ruger's serial number lookup tool or reference materials, as they provide a detailed breakdown of production dates based on serial numbers. If you have a specific serial number, I can help guide you on how to find its year of manufacture.
50-200 USD or so
You can request a owner's manual at the Ruger website.
20-200 USD or so
50-160
Go to gunbroker.com and look under Ruger.. It will give you a ball park...
A call to Ruger will get you the answer.
Upload a photo of it to a gun forum to identify it, guns are not identified by their serial number, they are identified by their model name. For example : Ruger Charger, Ruger Mark, etc.