50 Centimes

The Chambres de Commerce emergency notes of WWI-era Algeria exist because the French metropolitan banking system simply could not supply enough small-denomination coinage to the colonies during the wartime metal shortage. Constantine's chamber issued its own fractional notes under authority granted by the French government in 1914–1915, a stopgap that ended up running for several years across dozens of French and colonial issuing bodies simultaneously.

Arnaud's Lyon operation was the go-to printer for this class of emergency issue — they produced similar notes for multiple provincial chambres during the same period, which occasionally causes attribution confusion when undated proofs surface.