Pescennius Niger, AE of Caesarea-Germanica, Bithynia. 2.01 g. 

AVT K G PEC NIGROC, laureate head right.
KAISAREIAC GER, serpent with head right on garlanded altar. 

Apparently unpublished.
ex Bankhaus H. Aufhäuser, Auktion 13 (7. - 8. Oktober 1997), Nr. 405. 

Courtesy of Helios Auction 5, June 2011