The H&H Magnum follower is used for .300 H&H Mag, .375 H&H Mag, and other "long magnum" cartridges. This is an original Winchester part in excellent condition.
The pre-war followers have the top-side relief cut. Post-war followers do not have this feature.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE