This coin is an unattested variant of a known Corinthian reverse type without shield (see Comparanda). It appears as example 3 in RPC on-line: https://rpc.ashmus.ox.ac.uk/coin/454128
Laureate and draped bust of emperor to right; within dotted border
Obverse Inscription
[M AVR] ANTO-[NI]N[VS AVG P M]
Reverse Description
[Helmeted] Athena in peplos standing to left, holding spear in upraised left hand and Nike (traces) in outstretched right hand; shield resting upright against left leg and owl on ground next to right leg; all within dotted border
“KC095 (Early Roman bronze coin of Marcus Aurelius from Corinth).” In Kenchreai Archaeological Archive, edited by J.L. Rife and S. Heath. The American Excavations at Kenchreai, 2013-2024. <http://kenchreai.org/gaek/kc095>