Diadumenian AE28 of Nikopolis ad Istrum. Magistrate Claudius Agrippa. 

Obv: K M OPEL ANTWN(I DIADOVMENIAN)OC, draped bust right 
Rev: VP AGRIPPA NIKOPOLITWN PROC ICTPWN, Apollo, 
naked, standing right, right knee bent, with left hand behind 
him and holding a branch before him.

Refs added later: AMNG 1796; Varbanov 3694; Megaw NIC4.6f; Moushmov 1299.
Malcom Megaw Collection, Oct. 2011.