This looks more like a small aircraft's rudder or elevator to me. Has a torque tube, which is typical for both (and especially elevators), a ground-adjustable tab, and that large rib at the end to me looks like the bottom of a horn-balance.
View attachment 738066
Edit: is that big metal rib at the end of the assembly fixed to it or can it rotate independent of the rest of the part?
With those tinnerman nuts and X head screws in the diamond plate I don't think it's WWII or even German. Not sure what it could be, unless it's from the horizontal tailplaneHi this is my first post ....I have a interesting part flap or more likely an Aileron...? opinions welcome ...It was said to be off of a ME109. Thanks in advance....