50 centimes - Chambre de Commerce de Calais [62] 6ème émission

French chambers of commerce were authorized to issue emergency fractional currency during and after the First World War to address a nationwide shortage of small coins — bronze and copper had been diverted to the war effort, and centimes effectively vanished from circulation. Calais, as a major Channel port under sustained military and logistical pressure throughout the conflict, had particular need for low-denomination scrip well into the postwar period.

This sixth emission indicates the Calais chamber returned to the presses repeatedly across several years, a sign of how stubbornly the coin shortage persisted. Roy & Valade in Amiens handled a substantial share of northern French chamber printing during this period.