In my experience, brass stuff doesn't sell very well. Of course, that may not be true of your piece and, unfortunately, I don't know anything about this goblet. Does it look old? As to price, if you haven't already, I would take a careful look at the completed listings on ebay and see if you can find something similar. If you can't find anything like it, value becomes total guess work and, at the risk of being cliche, its value is however much someone will pay for it. Good luck. I hope it sells for a good price.