From my time where I want to have 1 coin from each emperor: Procopius, AD 365-366 AE - AE 3, 3.93g Constantinopolis, 4th officina obv. DN PROCO - PIVS PF AVG Bust, draped and cuirassed, pearl-diademed, l. rev. REPARATI - O FEL TEMP Emperor in military cloak, stg. half-left, head r., holding labarum in in r. hand and resting with l. hand on shield; Palm branch in l. field, Chi-Rho in upper r. field in ex. CONS Delta Ref.: RIC IX, Constantinopolis 17b var.; C.7 var.; (in RIC only officina Gamma and Epsilon but Delta expexted) very rare, EF, sharp, nice green patina The variant with the palm branch is much rarer than the usual 'unknown object' or the empty field. And there is no officina Delta listed nor yet found in any reference!
"The variant with the palm branch is much rarer than the usual 'unknown object' or the empty field. And there is no officina Delta listed nor yet found in any reference!" The palm is actually part of the mintmark and not an independent design element. The unknown object is likely a helmet