Finding the Original Model Bus...

It is likely we will not be able to buy an original model of this bus in America, but we'd surely like to find out what it is just to be complete in our information.

Even the Internet Movie Car Database has few leads... could be a "Willowbrook"
http://www.imcdb.org/vehicle_654113.html

But they do have more pictures:

The search continues...
http://www.old-bus-photos.co.uk/?cat=265