More pictures are needed,but to me it looks like an M43 missing the side flaps. The bill looks too thin IMHO, so I would guess that it's a repro or post war cap that looks similar to an M43 with period insignia applied. I'm no expert, but perhaps one will comment soon.
Here's an original example with similar trapezoid insignia. HG-65c* Luftwaffe Model 1943 Field Cap
A very poor fake indeed.
Search "Luftwaffe Einheitsfeldmutze".
You will see this one is not even close.
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