One more interesting find that I found on Axis Militaria Forum. I am not sure it has any relevance to this helmet plate.
"The Shield shows the old coat of arms of Wien (Vienna), homebase of Pz.Rgt. 3 (2. Pz.Div.). The silver cross on the red shield comes from the Reichssturmfahne (Imperial assault flag) used by the German knights during the Crusades and the double headed eagle was given to the city by Emperor Friedrich II. (Frederick II) in the 13th century."
"The Shield shows the old coat of arms of Wien (Vienna), homebase of Pz.Rgt. 3 (2. Pz.Div.). The silver cross on the red shield comes from the Reichssturmfahne (Imperial assault flag) used by the German knights during the Crusades and the double headed eagle was given to the city by Emperor Friedrich II. (Frederick II) in the 13th century."
Comment