Plautilla AE29 of Nikopolis ad Istrum. 

FOVL PLAVTILLA CEB, draped bust right.
VP AVR GALLOV NIKOPOLITWN PROC I, Athena, helmeted, standing 
right, holding spear and resting hand on shield 
standing on low platform.

Varbanov 3189 corr. (this coin, obv. legend corr.)

Courtesy of Akropolis Ancient Coins
http://akropoliscoins.com.