Yes, I've got one here that looks exactly the same. The black things are the rivets that hold the ground scrapers and the grey screws hold the cover.
Hutch: It's not an adaptor, it's a real duplex receptacle!
I'll post pics of mine as soon as I got my imaging software up again.
Mine is mady by Kopp, you can read the brand name on the back side of the bottom part of the receptacle, between the mounting holes. There's also VDE and ÖVE listing and the 10-16/250 rating.
