Rare! Bronze Post-Reform Radiate of Constantius I Chlorus  (minted 294-299 AD), Cyzicus mint, Roman Empire
 
Size: 20 mm, 3.4 grams.

FL VAL CONSTANTIVS NOB CAES, radiate, draped and cuirassed bust right / CONCORDIA MILITVM, Constantius standing right receiving globe from Jupiter standing opposite and holding sceptre, K and B in lower center. Cyzicus  mint. RIC 19a

Constantius I Chlorus: father of Constantine the Great.
This coin is guaranteed to be authentic.