That is a early M700, has the tombstone safety and short bolt shroud, and probably the 20" bbl. Manufactured 1962 to about 1967/68. It's worth $150-$200 more than it was a year ago.......
Around here, $500-$650 would sell it fairly quick.
Edited to add: 1966 was the last year of the 20" bbl. The tombstone safety and short shroud remained through 1968.
Last edited by alpinecrick; 01/24/21.