Hi Vic,
My understanding of these is that whilst they might be the godfather of the current crop of PCPs they are pretty crude beasts. In my view they are more of an inetertesting curio than a desirable collectable.
On that basis I would offer a valuation of £100-125 depending on how rough and non-functional it is. There may of course be more fervent Daystate fans than me that will put a higher value on it.
Cheers Rich.