1935
1934. A rather early pistol.
With the serial number that you have provided,your Hi standard M-101,.22cal pistol was made in the year 1955.
1,000,000,000
1971
Impossible to answer without a serial number.
Need the serial number
See link below to High Standard data. You did not give us model number.
With the serial number that you have provided,your Hi-Standard model E pistol was made by that firm in the year 1939.
Contact High Standard with the Serial Number and they will tell you when it was manufactured.
Pre 1950
Go to the Ruger website, customer service, historical data, pistol, find your model, and there is a serial number/ year of production list.With the serial number that you provided,your Ruger standard model single six revolver was made in 1960.If you have a standard model automatic Mark I pistol,it was made in 1957.
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.