Ave!
Olbia, Sarmatia AE Dichalk, 18mm, 8.3gm, 400-370 BC...?
O/ Head of Demeter r.
R/ OΛBIO above Eagle on dolphin r., grain ear below...?
Con/ F; original pastel green patina.
Ref/ None; can't find an exact match for this coin in any of our resouces.