Septimius Severus, AE17 of Nikopolis ad Istrum.

AV KAI CEVHROC, laureate head right.
NIKOPOLI PROC IC, Apollo standing right, holding arrow
and resting on serpent-entwined tree trunk.

Varbanov 2247 (this coin).
Gorny & Mosch auction 2002, lot 1598.