Type of British or Gaulish coin made from potin from the early 1st century BC onwards. Potin coins are unusual in that they are cast rather than struck. The earliest examples are the first kinds of coin made in Britain and are found mostly in southeastern counties. Derek Allen has traced the origins of the potin coin series back to the bronze coinage of Massalia some time in the 2nd century BC, the prototypes for the British series probably coming via Gaul. Also called Kentish cast bronze coins.