Looks a bit like one of these:

[Linked Image from elkonv.com]

I need a scale Paul, but I would say that the pins look like 5A and the holes on the side look like 5A ungrounded. The front looks like it has 5A grounded (outer holes) and ungrounded (centre 2) but all-in-all it's kind of weird:

Before I saw the pins on the back I though it was some kind of 3 phase, grounded wye (5 wire) recepticle!