the first sweater from Aloha Christina appears to be 60s: that acrylic, and the open weave are typical of that time.
Cori, your sweater does appear to be much older, that is a terrific label, and letter sweaters are typically really excellent sellers: that colorway of purple and white is great, too.
I'm not that familiar with sweater knits to suggest a date, but it's likely someone here will be able to help you. oh, and for the most part, we do not suggest values here, however, I will say that your sweater could easily fetch more than $90, possibly if the right people see your auction (if that's how you choose to sell it).
congratulations on a really neat find, Cori!