Irish Gunner,
Of course, I cannot tell the colors from a black and white photo.
My assumption comes from seeing a trench helmet in a collection back in the 1980s which had these colors on this type of shield. I've never seen anything else that resembles this shield on any other steel helmet. So, while I can't be positive, I can say that the only shield that I have seen that resembles this one was in the Baden colors. If you want to call the colors blue and white, I have no argument with that.
Regards,
Chip