Modern COPY of an ancient Greek coin from Syracuse, Sicily

Modern COPY of an ancient Greek coin from Syracuse, Sicily as follows:
Obverse: Facing head of the nymph Arethusa, signed Kimon in Greek
Reverse: Quadriga moving left with charioteer being crowned by Nike, Syracuse in Greek below.
26mm diameter, appears to be made from good quality silver, 16.73gm.
Purchased in Athens more than 20 years ago.