This sketch has kindly been provided by Uwe Hobohm, the brother of Annelie Hobohm. It was copied by their brother Carsten Hobohm from an earlier drawing by the famous family historian Max Hobohm and his son Fried Hobohm.
Details about the life and works of Christoph Jakob Hobohm can be found in "Die Hobohms im Schöninger Raum", pp. 3-4.

The english translation of the text is as follows:
"Seal by Christoph Jakob Hobohm, used on 13 March 1799 with a letter to his wife, Johanna Maria Günther. Drawn by Fried Hobohm 14 September 1930, and reproduced by Max Hobohm. Copied by Carsten Hobohm, 26 November 1968".