|Note_en={{Dating|seller}} Confirmed by a letter reporting for some duration test showed in a page. From an [[Edacoto]] catalog for its mechanical pencils and its fountain pens, showing also some [[Aurora]] pens. Seventh page. [[Aurora]] pens descriptiond for ''Le Duo Moderne''. | |Note_en={{Dating|seller}} Confirmed by a letter reporting for some duration test showed in a page. From an [[Edacoto]] catalog for its mechanical pencils and its fountain pens, showing also some [[Aurora]] pens. Seventh page. [[Aurora]] pens descriptiond for ''Le Duo Moderne''. |