During cold war this black-red-yellow was a flag of West Germany while East Germany added typical for Soviet block logo (click here to see it) in the middle of the flag during the cold war.
I remember my very amusing trip to Kecskemet, Hungary in late 80'. I met there two young Hungarians who invited us to their house/wooden cottage in the middle of nowhere (puszta) and they had large Hungarian flag hang on a wall with a whole in place of that logo which was surely forbidden that time.

