Johannes AE4, 11mm. AD 423-425. Rome mint. 

DN IOHANN-ES PF AVG, Pearl-diademed, draped and cuirassed bust right.
SALVS REI-PVBLICAE, Victory walking left, holding trophy over shoulder 
and dragging captive.
Chi-rho over Epsilon in left field. 

Mintmark RM .
RIC X 1916; Sear 21121.

Sold by Bertolami Fine Arts auction 24, Lot 971, June 2016.
Estimate £150.