The value of a Ruger M77 with the serial number 70-12920 can vary based on factors such as its condition, caliber, and any additional features or modifications. Generally, prices for Ruger M77 rifles can range from $400 to over $1,000 in the used market. To get a more accurate estimate, consider checking recent sales on platforms like GunBroker or consulting a firearms appraiser.
100-500 or so
100-1000 USD or so depending on specifics
The Ruger website shows that serial number range to be late 1974 to early 1975.
Ruger's website has extensive sn data.
Depending on condition, and WHICH version of the M77, between $250 and $500.
Go to the Ruger website. Under Customer Service, Historical Data, Rifles, M77, and the serial number groups for each year are posted there.
1990
100-500
Your Ruger model 77 dates to the year 1983 with the serial number that you have provided.
The Ruger website, under customer service, historical data, rifle, M77, will have the serial number ranges for each year of production.
Ruger has extensive sn on their website. The sn you list is not on it. You will need to call Ruger. 400 or so
Ruger's web site has extensive sn data.