Hang on to it. I love keeping things like that. Something like that, IMO, looks quite valuable.
I found a yearbook from 1964 about a year ago. All the kids in the yearbook were all black, so it obviously took place at time of segregation. Well, my cousin said she wanted to use it for her history project, so I was like, what the heck. I let her use it, and she tells me her history teacher lost it!!! :| Her teacher said he would look for it. I never got it back.
Don't let anyone borrow something like that. I learned my lesson.