Did you find it in Slovenia, or is a seller claiming that?
Celtic is definitely not my area of expertise, but I can tell you this much.
It appears to be a degenerate imitation of a gold stater from the Kings of Pontus. Most likely imitating Mithradates VI.
The obverse depicts a stylized deified head of Alexander the Great Ammon. The reverse is a bit puzzling, but appears to be Nike kneeling l., holding a palladium (small statue of Nike). But that doesn't seem to make any sense. The original coins depict Athena seated l., holding Nike so maybe this is artistic license? I dunno.
But an imitation is probably fairly scarce. My business partner is much better versed in Celtic coins and he hasn't seen anything like it before. I cannot vouch for authenticity of this piece, but if authentic, it's probably worth $1000.00+ retail.
Edited to add:
The other possibility is imitation of an AV stater of Alexander the Great. But the obverses on those depict the helmeted head of Athena, r. The wings on the main figure of the reverse could easily make this similar to the Nike portrayed on the reverse of gold staters. But the obverse on your coin is definitively not helmeted.
The Celtic artist may have made this from two different coin designs he liked. It would be rare indeed. I have seen an example with something like that reverse.
Comments
Celtic is definitely not my area of expertise, but I can tell you this much.
It appears to be a degenerate imitation of a gold stater from the Kings of Pontus. Most likely imitating Mithradates VI.
The obverse depicts a stylized deified head of Alexander the Great Ammon. The reverse is a bit puzzling, but appears to be Nike kneeling l., holding a palladium (small statue of Nike). But that doesn't seem to make any sense. The original coins depict Athena seated l., holding Nike so maybe this is artistic license? I dunno.
The original coins are fairly common:
http://www.cngcoins.com/coin.asp?ITEM_ID=36059
But an imitation is probably fairly scarce. My business partner is much better versed in Celtic coins and he hasn't seen anything like it before. I cannot vouch for authenticity of this piece, but if authentic, it's probably worth $1000.00+ retail.
Edited to add:
The other possibility is imitation of an AV stater of Alexander the Great. But the obverses on those depict the helmeted head of Athena, r. The wings on the main figure of the reverse could easily make this similar to the Nike portrayed on the reverse of gold staters. But the obverse on your coin is definitively not helmeted.
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