What is this for a unit???

[Tommy]

See the picture...

[ManuelR]

tommy, I am quite sure its from the 333 infanterie
division. akira can you confirm this? regards manuel

[Akira Takiguchi]

Yes, 333 had a quite similar marking, but I've never seen photographic evidence before; no confirmation possible

There were SOOOOOO many unit markings in the Wehrmacht, it is not so easy to correctly identify obscure one.