Cohn from West Prussia and Mecklenburg-Vorpommern
I happened to find Martin COHN, * 8 Nov. 1890 in Damerau, Kreis [county] Kulm, West Prussia. He went to grammar school and studied in 1921/1922 at Rostock University, Mecklenburg-Schwerin. His father, a Jewish merchant [Kaufmann], lived in Stralsund, Mönchstr. 37. He also studied at Greifswald University before 1921.
Maybe this information is helpful to some Cohn researcher.