Vista was a NY based marketing company, dealing primarily in entry level models. Most of the bicycles were manufactured by Araya, as was this one. Provided the OP has not made a typo, the big clue here is the decal. Note that it says "Tube" as opposed to the plural "Tubes". This indicates the only the seat tube is CrMo and everything else is hi-tensile. Circa 1981-1984 and not worth much, in my opinion.