The rifle predates 1970's for sure, however many people think that an old piece must be worth a lot.
There are several knowledgeable people that can give you a good idea what the rifle is.
That %*#@ Antique Road Show has done more damage to many collectibles by over inflating their "values"
But with study and education you can make a good purchase, and add to your Sutter collection
Best Regards
Old Ford