Wow, quite a score for $50!
Sante group comes with a chromed freewheel. Check for that.
The Trek 7xx hybrids were nice riding bikes. Your wife will be very happy.
Looks like it might be chromed. Hard to tell with 20 year old grease & grime all over it. But it's definitely shinier than the other freewheels I have.
And yes, I really like the 700 series MultiTracks. I have a 1990 790 that I ride several times a week.