It's not just a keyboard but a computer itself of course, like most 80s computers. I've seen it a few times but the name doesn't spring to mind right now, I'll see if I can refresh my memory on wikipedia or somewhere...
edit: no, I'm horribly wrong. It IS just a keyboard, designed for the Spectrum. Probably the Speccy itself is also residing in the case.
http://www.worldofspectrum.org/hardware/feat14.html
http://www.worldofspectrum.org/infoseekid.cgi?id=1000123