Hey guys, year ago I inherited my grandfathers 840 series e in .222 and I'm just now going through a full restoration with it, looking to get a little more info in it (mainly the year it was made) everything I read online these came around in the late 70s 80s but I have picture from old hunts with it being held back into the early 60s. Doesnt quite add up.

The serial number on it (assuming it's the serial number, located under the scope mount) is 5507859. And the barrel reads " savage arms Westfield mass usa, springfield model 840 series E. Proof tested caliber 222 rem.

And on the base of the barrel is a "50" in an oval and a "20" in an oval along with "sp7"

Any info is appreciated, thanks