Actually, at 20mm, this is most likely a late,
reduced stater. There are hundreds of similar
types issued by the tribes living from
Britain to
Galatia. A
very good overview is available in “Coinage in the
Celtic World” by Daphne
Nash (
Seaby Books, 1987).
I believe this to be a
stater of the East
Celts, one of the “ball cheek”
types listed in
Lanz 464-500,
BMC I S133 (
Type J1 xxxvi c, found between the Sava and Drava rivers in Croatia). These issues are characterized by the ball on the cheek of
Zeus, an annulet above the
horse and the pellet under the tail of the
horse. 20mm is a little small for these, but those illustrated in the
Lanz volume vary from a very crude 6 grams to a fairly refined
style at 11 grams. There are a number of very similar
types from this
area and I can’t say that I see an example that matches the
obverse style of your coin in every detail.
This would be an example:
http://tinyurl.com/4pkxgLanz M. Kostial, Kelten in Osten, gold und Silber der Kelten in Mittel and Osteuropa, Sammlung
Lanz. Muchen, 1997.
BMC John
Kent and Melinda Mays,
Catalogue of the
Celtic Coins in the British Museum, Volume 1: Silver Coins of the East
Celts and Balkan Peoples, British Museum Press, 1987.