https://magazine.nd.edu/assets/389519/200x300/rocknemask.jpg
Link: https://magazine.nd.edu/assets/389519/200x300/rocknemask.jpg
Nice article from OFD about it for some historical context.
Link: https://www.onefootdown.com/2020/3/19/21184514/throwback-thursday-notre-dame-football-and-the-1918-spanish-influenza-head-coach-knute-rockne