Stater Regenbogenschüsselchen Type

The Vindelici occupied the region between the Danube and the Alps — roughly modern Bavaria — and their coinage circulated across a territory Rome had not yet subdued. The "rainbow cup" name is entirely modern, a 19th-century German folk attribution: farmers plowing fields after storms found these small concave coins and assumed they marked spots where rainbows had touched ground.

The deliberate concavity is functionally unexplained. No Celtic technical necessity demands it, and no Greek prototype shares the form.