What makes it (in my opinion) a unique Holler guard is the tool work. On the picture above, notice the dark shadow in front of the eagle's beak and forehead, and then going over the top of the head. It is not tarnish, but removed material providing the shadow effect. The wings are also hand defined.
Finally, it has 2 features in common with the Wittmann pictured (page 35) guard. First, note the very round eye. They both have it. Next there is the unusual cresant shaped tool mark toward the back of the head. Here is the page 35 WIttmann guard.
