tetradrachm of Syracuse, 510-490 BC ca

Obv. quadriga slow, in field above SURA
Rev. head of female (Arethusa), positioned in a circle sunk at the centre of an quadratum incusum

Boehringer (V20R13)   17.42 g    Numismatica Ars Classica AG, Auction 13 8th October 1998 no. 423
                                 Ex Antikenmuseum Basel und Sammlung Ludwig no. 423

V20/R13 die coupling unknown to Boehringer

See die-coupling (Boehringer 1-31)