This is an aftermarket cartridge follower for a .22 Hornet rifle. 
Many of the .22 Hornet followers that come through our shop suffer from the same factory defect: a weak spring tab that easily breaks off.  This machined follower looks to remedy that problem with a stronger spring tab that is significantly less prone to breaking off.  The piece fits and functions identically to the factory product.
As a machined part, this follower ships in new/unused condition.