Sebastianus AR Siliqua. Trier.

Obv: DN SEBASTIA-NVS PF AVG, laureate, draped, cuirassed bust right 
Rev: VICTOR-IA AVGG, Roma seated left on stylized cuirasse or 
curule chair, holding Victory on globe and inverted spear.
Mintmark: TRMS. 

RIC X 1710.

Courtesy of Numismatik Lanz, München. Sold for 225 Euros.