This can make him rich way too quick lol As far its value is concerned it completely depends on the buyer .Now the next question would be how to find the buyers.Go bout searching the antic collection specialist on craiglist or personal blogs.Tell them your offer.Now you would like to know what can you offer .To find out again search for a few archelogist's online ,ask them the value of it or some agents will trade that for you on commission basis and they have their own experts .Conclusion is please take help from the experts before dealing it.