Septimius Severus, AE21 of Augusta Trajana, Thrace.

AVK L CE CEVHROC, laureate head right.
AVGOVCTHC TPAIANHC, coiled serpent with head right.

Varbanov 1007; Schoenert-Geiss 190

Note: This image was recovered after having been destroyed 
in the March 2009 website attack. The owner or seller
information was unfortunately lost. Re-added in September, 2011.