Gallienus AE of Nicaea, Bithynia. 7.18 g. 

Obv: POU LI EG GAL[LIHNOS S]EB, radiate, draped, cuirassed bust right.
Rev: NIKAIE[WN], Bird's eye view of the city walls, city gates
in foreground and background, tower on each of the eight corners. 

SNG Stockholm 1958; Price/Trell 190; RecGen 848