I've seen a couple of Vistas. One I saw someone riding just yesterday. They looked Schwinn-ish (they even had headbadges with a similar oval shape and color) but not quite, as they appeared heavier and had lesser components on them.

Megasloth, that Vista looks a lot different from the ones I've seen. The lugs look like those on a lower to mid-range Japanese bike I sold a while back. What does the sticker on the downtube say?