Ruger has sn data on their web site.
Ruger's website has sn data you can look up.
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Ruger's website has sn data you can access
Ruger has mfg dates on their website, Look for historical data under customer service.
when was this luger Mfg,Serial # 2869
Go to the Ruger website, Customer Service, Historical Data, Handguns, find your model, and there is a serial number/year table.
== ==
1981
mfg date of your smith should be between 1860-1868
by the serial number
about 1915
1949