keep. In the condition it is in, you will not get it's worth on ebay.
I would ask for a quote at a reputable jeweller and ask if they have payment options (weekly, monthly, whatever

) It may turn out to be more affordable than you think.
If they quote you too high a price, either try elsewhere or wait until you can save up a bit.
As a museum studies student, I would keep it for the sentimental value, but also the historical value, haha, although I'm no expert! I'd love to see it! best of luck with it anyway