With the serial number that you have provided,your Hi-Standard model E pistol was made by that firm in the year 1939.
1971
1934. A rather early pistol.
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.
1978
1958
1941
Pre 1951
Early 1934
SN does not have enough numbers.
Go to www.histandard.info There is information about manufacturing dates.
Charles Petty's book might have it.