It is now estimated CHF 600K for sale by NAC in Zurich on September 24, lot 8 here linked to Sixbid bidding platform. I narrated it as follows before the 2016 sale :
The city of Naxos near Catania on the eastern coast of Sicily was the earliest Greek colony in that island, anticipating Syracuse, and got its name from the Cycladic island with which it should not be confused. It was also one of the first Western cities to develop a coinage struck on both sides.
Naxos and Catania are emptied of their inhabitants about 474 BCE by the tyrants of Syracuse. The political dominance is reverted following several rebellions, and freedom is retrieved in 460 BCE.
A tetradrachm was issued in Naxos in Sicily at that time, certainly for celebrating the end of the exile. Its bold rendering of Greek gods is a masterpiece of ancient coinage without being an artistic renewal. It is believed that the same artist had previously executed a tetradrachm for Aetna (Aitna) which was the name of Catania during the Syracusan occupation.
On one side the portrait of Dionysus in full surface is remarkably well balanced for its time with a thick beard and a smile that may be vicious. He wears a wreath of ivy leaves. On the other side the invitation to debauchery is indeed worse ! Silenus squats in full nude, vigorously muscular and ithyphallic. The bust unbalanced by intoxication, he inspects the cup that contains his beverage.
SOLD for CHF 725K before fees