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My Eichstaedt line came from Jastrow Prussia (now Jastrowie in Poland) at least in part in 1872 - Hanna Malvine Albertina Damrow Eichstaedt and her children, Albert, Wilhelmine, Auguste, Lina, Otille, Elisabeth and Theodore. They came over via Bremen, arriving in New York on the Smidt, arriving August 10, 1872. The father, Ferdinand Edward (or Edward Ferdinand) apparently came over earlier than the rest of the family. They lived in New York for a year and then moved to New Britain, CT. Around 1890, several family members moved to Chicago for a time - some stayed and some moved back. I am not sure if there is any relation, but I thought it coincidental that my ancestors came over on the same ship exactly two months after the Constantin you identified.