1983 Trek

Hello all! I'm going to look at a Trek Multitrack tomorrow. From what I can tell at this point, it appears to be a 1983 (I'll confirm this when I see it). It's a 21 speed, women's bike that's been kept in storage for the last 30+ years. It's all original and, aside from a little rust on the chain, appears to be in great shape. Any thoughts on what it might be worth? Thanks!

*I'm new here and can't post photos yet...sorry.*