I believe akimbo is right about the alps. I have two of these (game one to a friend). Unfortunately, the keycaps are smaller than standard, so I had to shave the NeXT keycaps I put on it. Second, the keyswitches do not appear to be compatible with monterey keyswitches (The only other alps-like I've used). At the least, they have a different aspect ration (less square) and wouldn't fit. It may be possible to mod the plastic plate to fit them though.
The design and features are really great. You can (for example) computer a sum, and press a button to send it as a string over to the computer. It's a combo tenkey/hand calculator and is battery powered when not operating via USB. I'm sure you could modify it to operate via solar power, if you could find room for the panel. The build quality is rather lacking. It was probably worth the $20 or so I paid, but I certainly wouldn't pay 50 GBP for it.
