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? [Linked Image] (Runs, ducks, and avoids flying objects..... [Linked Image] )