Gallienus, AE25 Pentassarion of Serdica, Thrace. 

AVT K GALLIHNOC, radiate, draped, and cuirassed bust left, 
holding spear and shield.
OVLPIAC CERDIKHC, the Three Graces standing, the one in 
the middle kneeling right. 

Varbanov 2649; Ruzicka 490; Hristova & Jekov 12.46.26.3 = Staal Fig. 17 (this coin).

Courtesy of Mark Staal, Feb. 2010.