I am in search for any information and/or documents regarding Johan Henrick ECKMANN (my 2nd great-grandfather). I don't have a birth year for him but he was either born during the late 1700's or early 1800's. He married Grethe RASMUSSEN (my 2nd great-grandmother -- born 24 Jun 1825 in or near Domkirken Parish, Stavanger, Rogaland, Norway). They were married on 21 Sep 1841 (I don't know if they married in Norway or in Germany).
It is my belief that Johan Henrick Eckmann was born in or near Hamburg, Germany (perhaps Gluckstadt, Steinburg, Schleswig-Holstein, Germany).
Any information on his parents and/or family will be greatly appreciated.