There's a Vista version of their food processor from that period too. My sister has it. I think the only difference is that it has some kind of a "shooter" option to send shredded/processed contents into a separate bowl.
That blender was obviously produced after Sunbeam took over the Osterizer line. My one experience with owning a blender that had a round carafe (a repro Oster beehive) was that performance wasn't as good as with a square or cloverleaf shaped one.
Believe it was a second line so they could alter the content slightly--remember that there were a lot more individual department stores at the time so, in St. Louis, for instance, both Famous-Barr and Stix Baer and Fuller could offer Sunbeam, but Stix got the "Vista" line.