Was clearing the attick at a relative and found this wall flag or what it is called from the Olympics in Berlin 1936 and another which says it is kaiserliche reichskriegs-flg on the print

I dont know the full story but know that it was given as a present after the end of the war. My relative was an engineer and doing some work for defense contractors.

How can I checkif if it is not a fake, I dont belive so but would like to make sure just in case I decide to try to sell it.

Thx for checking ut my post - any feed back would be welcomed