Alexandria, Troas. AE23, semi-autonomous. 138-268. 4.62 g. 

CO ALEX TRO, Turreted and draped bust of Tyche right; CO AV 
on vexillum to left
COL AV TROA, horse grazing right. 

SNG Righetti 772 var (TR not TRO on obv.)

With permission of Pecunem Gitbud & Naumann, Auction 23, Oct. 2014.
Estimate: 50 EUR.