If you received this as a gift or inherited it from someone, such as your grandparents, it has far more sentimental value than retail value. The $40 or so you might get from listing it on eBay will be gone fast and you'll wish you had kept such a tangible memory of a lost relative.
Definitely a keeper - nice coin of a very interesting period in history. You might want to read Josephus' the Jewish War as a backdrop.
Here is a link to an online version of Josephus (in the public domain) http://penelope.uchicago.edu/josephus/
