Mytilene, Lesbos. AE15, ca AD 250-268. 2.73 g. 

Head of Zeus Ammon right with horn of Ammon
MYTILH-NAIWN, bearded herm of Dionysos facing, on prow, 
thyrsos in left field, mask right at lower left.

BMC 121-125; SNG von Aulock 7754
Rare. 

With permission of Pecunem Auction, May 2014.
Estimate: 125 EUR.