Athena, Attica, AR tritemorion. ca 479-404 BC. 8 mm. 0.53 g. 

Helmeted head of Athena right.
A-EQ surrounded by three crescents. 

BMC 187-190; Agora 21b; SNG Cop 57-58.

With permission of Numismatik Naumann auction 48, lot 86, Nov. 2016.

There are a number of variants of the reverse: 
A-E (retrograde) Q = BMC 183
A-Q E (retrograde) = BMC 184-186; Agora 21a
A-E Q = BMC 187-190; Agora 21b; SNG Cop 57-58
A-Q E = BMC 191