Go to the Ruger website, Customer Service, Historical Data, Handguns, find your model, and there is a serial number/year table.
Ruger's website has sn data you can access
Ruger has sn data on their web site.
1957
Ruger's website has sn data you can look up.
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Ruger has mfg dates on their website, Look for historical data under customer service.
1988
Published books.
I just got a R-106 Sentinel Deluxe High Standard Mfg. This is a .22 cal, nine shoot revolver. Mine was passed down to me by my Granddad, he bought it for my Grandmother, in either 1967 or 1968. Hope that helps some.
Impossible to answer as asked.
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In books that have been published on the company.