I bet that this set was bought by a US serviceman stationed in Germany. They all brought home German HiFi sets, and a hand full of TVs too, I guess. My mother was in the Air Force in the late 50s, and when she came home when I was born in '67, she brought a Telefunken stereo among her belongings and a 1958 Opel Olympia. All was shipped free by the Air Force, I believe.
And about the Germans locking doors; not only do they lock them, they
SLAM them
. My grandmother was VERY German.
Charles