These are Redfield steel 1" Junior rings with the 4 screw cap. These were made in Denver Colorado and are identical to the rings used by the U.S. military adopted for issue on Vietnam sniper rifles in 1965, except without the 1"-64 stamp on the bottom.
These rings work with Redfield JR and SR bases, as well as with Leupold STD and other similar base designs.
All rings are vintage used parts, in very good to excellent condition.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE