Johannes, AV Solidus, Ravenna mint, 423-425 AD.

DN IOHANNES PFAVG, rosette-diademed, draped, cuirassed bust right.
VICTORIA AVGGG Johannes standing right, stepping on captive, holding labarum and Victory on globe.
R-V across fields, mintmark COMOB.

RIC 1901, Depeyrot 12/1

Used with permission of CNG (cngcoins.com), sold for $3,000.