The second shield is the shield of Werras unit, Jagdgeschwader Udet!
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I think the Drilling was the Amtswaffe of a Förster!
Until today we have many different forestry-districts. Town-, land-, county-, privat- and "Bundes"districts!
Forestry-districts on military training areas are called Bundesforste. There the foresters are in pay by the Bundeswehr, and the owner of the forestry superintendents office with all goods is the Bundeswehr.
This gun was a gun of a Förster on the ground where Jagdgeschwader Udet had been stationed. On one of the grounds they were stationed!