I was luck enough to win the following bust from Ebay the other day (Boneaparte's Crusader bust) that is now long OOP. However my question is concerning the helmet as I know its a flat type of medieval knight helmet yet despite exhaustive Google searches I cannot find a flat type helmet with a nose guard. I also noticed that the helmet requires a chin strap to make it stay on the wearers head. Can anyone help me with these historical details?