Alexandreia Troas. semi-autonomous issues. AD 138-268. AE19, 5.58 g. 

COL TRO, Turreted and draped bust of Tyche right, AV C on vexillum behind.
COL AVG TRO, horse grazing right. 

SNG Stockholm 2164; Duesseldorf 6494. Legend combination not in Bellinger. 

With permission of Roma Numismatics, Ltd - Auction 4, Lot 1528