Hi can you possibly post a pic or scan of both sides of the coin just so that we can be certain which one it is you are talking about.
Now as for value it is worth precisly what a collector will pay for it, I know that might sound vague but that is the truth of the matter. If you put it up on ebay then good luck with getting the best possible price

I would sugest that if you list it to make sure that you post very clear pics of both sides and make absolutly sure that when you send it to the winning bidder it goes fully insured and not just proof of posting.