This is one of thousands of models of different types of aircraft that were made for training purposes, particularly during wartime. It lacks surface detail because aircraft spotters had to learn to identify planes very rapidly by their overall shape.
ORIGINAL, RARE WWII German Luftwaffe Aircraft Recognition Wooden Model ILYUSHIN IL-20 /22. “Recognition Models” (also known as “ID” or “spotter” models) were seen as critical to the war effort. Some were detailed for use in educational films or for marking identification, but many were simply painted black to simulate a silhouette. These helped familiarize observers with the outlines of planes from all possible angles.