Le type Mercure figure sur deux entier d’avant guerre.
Elle a été imprimée en typographie à plat en mai et juin 1939 (dates de la 16ème à la 35ème semaine de 1939 – 916 à 935)
Elle a été imprimée par E. Desfossés en feuilles de 36. Le timbre a un type particulier sans signature.
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