BTW this is the only coin I own struck in this style like ancients are, no reeded edges: I have no idea of the value, had it for awhile but haven't been able to locate any info on it. Looks like a rider on a horse on 1st pic, I think the other side is a bit off struck.
http://www.forumancientcoins.com/dougsmith/bh.html Some of your questions will be answered by reading my page above. You can sell it for whatever someone will pay. I do not do appraisals. Missing the entire head of the bull is not a point in the coin's favor. There are many, many variations of these. To catalog it, find a copy of Jitals by Robert Tye.