If they still have it, the is an old PDP in the Utrecht office
of Digital. As far as I can remember (have seen it at least 10 years
ago) it's blue, has 3 panels and the centerpanel has a round tube
(a scope tube?). There were also a lot of switches on the panels.
I believe that the University in Utrecht has a museum of some sort
with various computers which they used over the years.
You might like to go to the Waterloo square in Amsterdam, every
Monday till Friday there is a flea market, and certainly there will
be some vintage stuff for sale.
Ed