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Ruger's web site has sn data on it.
Go to the Ruger website, Customer Service, Historical Data, find your model, and look up the date of manufacture.
Contact Ruger customer Service thru their website, they can give you date of manufacture.
Ruger has date of manufacture data on their website, under customer service, historical data.
If you are seeking date of manufacture, contact Ruger through their website. Values depend on condition- anywhere from $100-300.
The Ruger website, under customer service, historical data, pistols, will list the serial number ranges for each year of manufacture. Get the serial number, and hunt it down. Good luck.
1980
1973 or so
1967-1988
January, 1951
In 1974.
Ruger's web site has sn tables.