Here is a sharp looking card of Herschel which just found its way into the Hoard.
It is a 2015 Panini Immaculate Immaculate Authentics #10 card. This card contains a patch of game used material.
Panini in general, and especially of this year, has tons and tons of insert sets, of which this is one. In fact, Herschel Walker is not even featured in the base 2015 Immaculate sets.