CIMRM 2351 - Tauroctony. Patras, Greece.
This item is a damaged tauroctony found at Patras in Achaia in 1912. It may have some connection to the discovery in 2001 of a Mithraeum at nearby Aigio.
From the article on the latter by E. Kolia ("The Cult of Mithras in Aigion"):