These are Redfield 4 screw cap steel 1" Junior rings which carry the U.S. military 1"-64 stamp on the bottom. These rings were made in Denver Colorado and are the version that the U.S. adopted for issue on Vietnam sniper rifles in 1965.
Priced according to condition and height.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE