Macrinus, AE28, Nikopolis ad Istrum.

AV K OPPEL CEVH MAKRINOC, laureate, cuirassed bust right, seen from behind.
VP AGRIPPA NIKOPOLITWN PROC IC, Macrinus and Diadumenian
in quadriga right, led by soldier holding vexillium,
trophy and two seated captives above.

Varbanov 3356 (this coin cited)

Original CNG information lost in website attack, March 2009. 
Re-added in Jan. 2011.