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Solidarity coupon of 1 franc issued in 1919 to support distressed civilian populations and prisoners of war. Front: portrait of a man in bust form, text 'Solidarity Coupon', and illustration of a hot soup. Back: text explaining the use of the coupon, publisher 'Secours National Croix-Rouge Française' and 'Comité National d'Entraide aux Prisonniers de Guerre'.