EL 45% '1.5-shekels' of Carthage (Zeugitana), c. 255-241 BC

Obv. head of Tanit
Rev. horse standing r., above radiate sun-disk flanked by uraeus-cobras, two pellets

Jenkins-Lewis 409   10.87 g   Numismatica Ars Classica AG, auction 13 (1998) no. 570, trihemistater c. 250 BC

Standard used reduced version Phoenician tridrachm or 1.5-shekels (theoretically 11.40 g)
The equivalent in silver must have been quite arbitrary.