Infantry assault badge in silver -‘Vienna design’ unknown maker

Infantry assault badge in silver -‘Vienna design’ unknown maker. Late war semi-hollow scooped out K98 Vienna design IAB with silver finish. Remains in unworn condition but wasn`t stored too well over the years and lost very minimal finish from contact with other badges. Light fade spot on the back, but overall very well preserved and uncommon IAB, that has not been linked to a maker yet.