50 centimes - Chambre de Commerce d`Eure et Loir [28]

French chambers of commerce were authorized to issue emergency small-denomination notes during and after the First World War to address a severe shortage of coins — silver and bronze had been hoarded or melted down, and the national mint could not keep pace with demand. The Eure-et-Loir chamber's issues were printed locally by Trochard in Chartres, which was standard practice for the smaller departmental issuers who lacked contracts with the major Paris or Lyon houses.

JP#45.9 places this within a well-documented series. The Trochard-printed notes are generally found in circulated grades; the paper wears quickly and the watermark is often difficult to read clearly in heavily used examples.