Ammon is another horned figure found in Greek Mythology .. But the structure and composition of the cup, plus the inscription on the base, will really tell you how recent this is....it definitely is not ancient, although it may be a tourist reproduction.
I'm not sure that you could describe Pan as an evil God, KC's description is probably based upon his looks and reputation..
Greek God, Pan - who is the most evil form of The Devil in Greek .. he is no oil painting for sure
but neither am I ...
, and in Mythology there were a number of Gods that behaved a lot worse than Pan, although many of his failings were to do with young nymphs. It is maybe unfortunate that once Satan started being depicted in a similar form that Pan acquired a darker side in public culture, especially amongst some cults in the 18th and 19th centuries. And they say there's no such thing as bad publicity