SALVS REIPVBLICAE (18 january / 17 november 474)
Bust of Leo I facing, cuirassed, wearing a helmet with crest and a pearl diadem. Holding a spear passing behind his head with the right hand and a decorated shield with a horseman slaying an enemy, with the left hand.
Leo II on the left and Zeno on his right, both seated on throne. A latin cross placed between their two heads. A star placed Between REI and PVBLICAE.
Marks
Photo of a coin sold the 11/05/2022 by Classical Numismatic Group, Auction 120, lot 977, link to the sale and their website: https://auctions.cngcoins.com/lots/view/4-5IONG0/leo-ii-with-zeno-ad-474-av-solidus-21mm-448-g-6h-constantinople-mint-1st-officina.
I did not note any variant of step as on the coins without officina letter or with other officina letters. The copy of the Dumbarton Oaks remains to be seen.
On the obverse I noted ''Bust of Leo I'' because it is obvious that it is not a portrait of Leo II who is a child.