Trebonianus Gallus. AE21. 251-253 AD. AE21 of Nicomedia in Bithynia. 

Obv: C BI TER GALLOC AYGY, radiate, draped bust left, holding spear and shield.
Rev: NIKOMHDIWN DIS NEWKOR-WN, Emperor on horseback right, one hand raised. 

Sear 4316v, Varbanov 4208v., BMC -. Very Rare

Contributed by Dane for Roma Numismatics, June 2009