Ragnar,
Hope you don't mind -- I've taken the liberty of editing your post to rescale the image.
That's an interesting combination. Looks like the manufacturer just riveted the Leviton receptacle onto a German frame. It appears from the other holes and cut-outs that the frame is a general one used for other devices.
That's not an AL/CU receptacle though. The markings are telling you that it's
not suitable for aluminum wire.
Oh, and did the photographer have this upside down when he took the picture?
(Runs, ducks, and avoids flying objects.....
)