They sold me the following coin as Numidian, but I cannot identify it.
Size 16-17mm, weight (sorry NA), composition: bronze?, hammered.
Similar coins:
Numidia: N#392292 (but these coins are larger and horse has different leg positions)
Trinovantes: N#123999 (but horse is less classic, more abstract)
Central and Eastern European Celts: N#190550 (bust different, horse somehow similar)
Obverse: radiated bust, not clear

Reverse: horse left, with the first leg up and the other legs down, there seems to be a star or similar symbol in the upper right.
