It is called Sturer Emil or in english stubborn Emil. Iirc there were 2 on the eastern front. They were kinda effective due to the high penetration on long range. One got destroyed by a bomber and the other one was given up and later captured by the soviets.
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Gefreiter Mätthäus Hetzenauer - best sniper from the Wehrmacht

Best scoring tank commander Kurt Knispel

Knispel on the right

Knispel in color

Erich Hartmann - best fighter pilot in world war 2 with 352 air victories
I would appreciate if we have some text about the pictures what could be seen, who is it etc. instead of just pictures.