Chalkis. 340-294 BC or possibly a little later.
Denomination : Silver drachm
Reference : Sear Greek 2482
Size : 16.2 x 17.3 mm. Weight : 3.55 grams.
Grade : aVF
Obverse : Head of Hera right.
Reverse : Eagle flying right, carrying a snake, with CAL naming the city, with a caduceus below.