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Postcard showing the Stadthalle of Mainz, a monumental stone building with a dome-roof and ornate façade. Printed text at the top left indicates 'Kunstverlag Jos. Wilh. Heeg, Bonn' and the number 4013. Reverse: address to Madame Jeanne Gruber, Salpêtrière Hospital, Paris, with handwritten text dated around 1900 and a German postmark.