Gaul, Lingones AE20 Potin unit. ca 100-30 BC. Potin AE 20 mm, 1.99 g.

Three dolphins or fish swimming left around central dot in circle, all within circle of dots.
Three s-shaped ornaments around central dot in circle. 

De la Tour 8329; Castelin, SLM 604. 

With permission of Münzen & Medaillen (DE) GmbH auction 46, Lot 482, Feb 2018.