You will have to call Ruger to find out.
Ruger's website has a sn fucntion that allows you to find out when a firearm was made.
Call Ruger and they will tell you.
You rifle appears to have been manufactured in 1983.
That is not a model number, but the serial number. Go to the Ruger website, look under customer service, historical data, Slect rifle, shotgun, pistol or revolver, then find your model. There is a serial number/ year list for all Ruger products.
Ruger has sn information on their web site.
Ruger website, under customer service, historical data, lists year of manufacture by serial number for different Ruger models.
Ruger's web site has sn data.
You can look up the serial number on Ruger's website.
That's the serial number, not the model number. The year of manufacture appears to be 1984. More details can be had by leaving a message including the model of rifle and serial number with Ruger customer service at 603-865-2442.With the serial number that you have supplied,79-51197 your Ruger model 77 rifle was made in the year 1985.
1970
You did not say whether it is a rifle, pistol, or revolver, so we cannot tell- but you can find out at the Ruger website, under Customer Service. They list the serial number range for each year's production, but is is broken down by model- which you did not give us.