Original German WWII Luftwaffe Aircraft “Vorsicht!” Aircraft Plexiglass Cover - Needs Research

Original Item. Only One Available. This is an interesting piece that we believe came off of a Luftwaffe aircraft, but we aren’t certain where it would have been. The piece measures 7 x 4¾” and is inscribed in red:

Vorsicht! Beim Betäti=
gen des Schutzen=
Klappenhebels

Which translates to:

Caution! When operating
The protective
Flap lever

This could be for a myriad of aircraft and locations, so we aren’t sure of its origin. A great research project! Comes ready to display.