Probus AE Antoninianus 3.28 gr, 21.39 mm. Siscia. 277 AD.

Obv: PROBVS AVG, radiate, helmeted and cuirassed bust left, holding spear and shield.
Rev: CONCORDIA MILIT, Emperor standing right, clasping hands with 
Concordia, standing left, T in lower centre, mintmark XXI.  

RIC V-2 Siscia 668; cf Sear 11967.

With permission of TimeLine Originals (www.time-lines.co.uk), June, 2011