A bottle of Kujawy bitters (“Kujawy stomach essence”) made by Hartwig Kantorowicz AG of Posen (Poznań), then Germany. Front label describing the contents as “Kujawische Magen-Essenz” in German, “Essencya żołądkowa kujawska” in Polish. The number 1823 refers to the year when the company was established, not when this bottle was made.