I've got the same 3 aperture peep sight on my Savage Model 3 (single shot). Very accurate little rifle and one of the best triggers on any of the 22's I have.
It has a Savage rear bbl sight that the leaf folds down flat for use with the Peep Sight. That bbl sight is windage adj also with a small 'wheel'.
The front uses interchangeable inserts under a hood. I think they came w/3 of them originally, but I only have the one.
They certainly made a confusing bunch of models and versions betw the Savage and the Stevens lines and pre and post War.. I think the Savage Model 5 is the Stevens 66 counterpart.
Haven't quite figured what made some of them an '066' instead of a '66'.
Maybe just catalog numbering.
Another reason I don't seriously collect things,,my mind starts to hurt trying to figure stuff like this out.
Then they had the A version of the action where the bolt handle locked against the rear of the ejection port.
The 'B' style action, like here, locks further back in the rec'vr from the port. I think these were also named 'Buckhorn' series rifles.
Then it all gets pretty foggy trying to separate them from there on out...!
Nice little rifle! Great price IMO. They'll plunk bullseyes all day long for you.
Looks like the pre-WW2 version as the safety is on the bolt head,,pull it back and turn it CW to set the striker on the edge of the rec'v. (same as the Mosin Nagant).
Post war added a thumb safety on the right side/rear of the rec'vr. Trigger guards were steel pre-war. Went to aluminum or a zinc casting & plastic after the War but probably some changeover period to use up old parts exists. They didn't throw nuthin' away.