Constans AE medallion, 22.23 g, AD 337–340. 

D N FL CONSTANS AVG, laureate, draped, cuirassed bust right.
VRBS ROMA BEATA, Roma seated left on shield, holding Victory 
on globe and sceptre. 

Gnecchi 32; Cohen 118; RIC VIII 377. 
Very rare. 

With permission of Numismatica Ars Classica auction 106, Lot 1066, May 2018.