Yes. That is a combo NEMA 5-20 (top for 120 volt 20 and 15 amp plugs) and a NEMA 6-20 (bottom for 240 volt 20 and 15 amp plugs).
Dual Voltage receptacles I've seen them called in one catalogue. Don't know if they're still manufactured. I've seen them primarily in old public buildings (especially one very old high school).
Looks like a wood or plasterboard wall to me. Look at the edges of those screw holes. They look like what's left after you take a screw out of a wooden panel or plasterboard with paper covering.
[This message has been edited by SvenNYC (edited 10-27-2003).]
