Watch List notes:

Greek Italy. Southern Apulia, Sidion. AE 15 mm. c. 300-275 BC. Overstruck on a Metapontum bronze, 350-300 BC. D/ Laureate head of Zeus right; traces of undertype fully visible: barley ear behind the head and ethnic MET[A] on the neck. R/ ΣΙΔΙΝΩΝ. Herakles standing right, leaning on club set on rock to right. HN Italy 822. BMC 1-2. AE. g. 2.64 mm. 15.00 RRR. Extremely rare and in excellent condition for issue. Green brown patina. VF.

The only coin type issued by this city. See: 'Libero Mangieri G.: Le monete di Sidion e la circolazione monetaria nel periodo classico-ellenistico a Gravina in Puglia e ad Altamura (BA)' in RIN 2001, CII, pp. 49-87 (no overstruck specimens cited).