It just means the box is a post January 1916 box. They used label for several years before updating them. They also did not update the top label at the same time as the side label.

To pen down a range of production, you need to know when the next top & side label was approved, and then you’ll know the range of years the box could have been made in. I say box, because the empty box could have been labeled and sat around a while before being loaded / sealed with ammo. This is especially true for the top label, as the side label is the label that seals the box.  Also you can easily locate several boxes that will have another label glued on top an older one. But that will using be found on calibers that were in less demand and would of sat at the factory before being moved out and sold.

Sincerely,

Maverick