hi Tambo,
I am by no means an expert on these white ones, howerver I have seen them in the aq store I use, they were a light grey ,with black spots , normal eyes, and were active when touched. Very healthy looking .
there could be other types of white plecs, but as the other members have stated ,this one looks to be on his last leg, compared to the whites I have seen.
Good you took a pic and asked here , the members are just trying to save you heartache and money.
If you have your heart set on a white plec, ask your local aq shop to be on the look for you. Here in US, the aq shops get a list of available plecs weekly ...not sure how it works over there though.
good luck ,
georgie