Islands off Attica. Aegina 525-480 BC.
19 mm., 12,20 g.
Sea turtle, head in profile, [with trefoil collar], c/m: Two ram's heads back to back / Small incuse square with skew pattern.
Meadows, Aegina, Group IIc; HGC 6, 434.
The type of this countermark closely resembles that of the bronze coinage of Kebren.