Found original part?

[Vagabond Elf]

Paterson also sold another model of slide viewer, the Viscount. It seems a strange coincidence that it would share the name as the plane the Astromech Holo Projectors come from. 

I know this is necroing this thread really badly - but I wanted to say that this sort of information is why I think this site is very valuable.

Also, some speculation about the names. The Vickers Viscount was operated British European Airways, which mostly flew between the U.K. and the continent. Another aircraft operated by BEAC was the Hawker Siddley Trident. In an era when commericial air travel was still highly romantisised, these names would have been well known - to anyone who'd flown on one of them, at least, even if they weren't household names.

A major, if not the primary, target market for the Paterson slide viewers would have been people who wanted to look at their vacation slides without setting up the whole projector system.

My speculation is that Paterson's marketing department was deliberately evoking the names of the aircraft that British tourists were likely to have flown on, in order to build an association between Paterson's product and the good times people had in Spain, Italy, or Provence.