My mother was a Tessmann. Lineage is me Jay R Jacobs > Connie Tessmann > Elmer Herman Tessmann > Johann Herrman Tessmann > Wilhelm F. Tessmann. Wilhelm and his wife Bertha Gruhkow, imigrated to USA from Bremen through Baltimore on the Bark "GAUSS" in May 1872, and settled in Watertown, WI. According to Watertown's St Mark's Lutherine church records Wilhelm and Bertha came from Kolberg, Prussia. I don't doubt we are related and would love to here from you.