Old Winchester model 63 with what I think is a Lyman peep sight, I shoot this one often and it works fairly well....
The small tab is a lock mechanism the sight folds down for protection.
The knurled sleeve rises and lowers the peep.
The 1/2 dollar size piece is removable and the sight is still usable...
I know nothing about this sight , except that I like it, feel free to enlighten me on any knowledge you want to share..
Looking forward to pics of more iron sights..........

The small tab is a lock mechanism the sight folds down for protection.

The knurled sleeve rises and lowers the peep.

The 1/2 dollar size piece is removable and the sight is still usable...

I know nothing about this sight , except that I like it, feel free to enlighten me on any knowledge you want to share..
Looking forward to pics of more iron sights..........