Metal trial pattern by Muller

The Directory period that followed the Terror produced a flurry of proposed coinage designs as the new government scrambled to establish monetary credibility after years of assignat collapse. Muller's billon trial pieces from this moment represent the competitive pattern-submission process then in use, where engravers submitted physical proposals for official review rather than working from a central commission. Whether Muller's submission was seriously considered or simply archived is unclear from surviving administrative records.

Billon — a silver-copper alloy with low silver content — was a practical choice for trials intended to simulate the weight and strike behavior of a circulating fractional coin.