Post war M38 Tanker Helmet Help

I recently picked up, what I believe is a Post WW2 German Made Tanker’s helmet, most likley made by Maury and Company Offenbach/M. Also known as a USAEURO Tanker Helmet. It appears to have the aluminum Dome and the pepper pot air vent holes.
I believe that these helmets were made for US troops in Europe, and some may have made their way to the Korean war.
If at all possible, if anyone has any thoughts or can make out any of the writing on the inside leather lining, and the "Interesting" insignia written/drawn on both ear flaps, it would be appreciated. It appears that the insignia is a "S" and a "Z" written on top of each other. Could it be a soldier’s initials, a Unit marking..etc? Also,it appears that the helmet was repainted. There is also a red paint "B9"? over top of white letters peeking through the paint.
Any additional thoughts about the helmet, history, writing, would be greatly appreciated.

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