Rare prototype I got from a guy who’s dad worked at Mattel in the 70’s & 80’s designing toys. This is the only known example of this idea. Looks like his idea was to add aroma smells to the front in order to get to 4D. Non-working mock-up invention idea.

Cool piece of toy history.

Rare Prototype 4D View-Master Viewer Red & White GAF Vintage 1970's 3D

I ship fast!