Burgermeister in Alt-Ruppin?

My Great-Great-Great-Grandmother is Luise Friederike Catherine Helene von
Kardorff (1814-1882). According to G.M.C. Masch she married a man with the
last name Daehne who was Burgermeister of Alt-Ruppin. Does anyone have a
reference that would show the full name of this Daehne or Dähne? I presume
he would have been the Burgermeister sometime between the 1840s and 1880s.
Any other information about this man and his family would be appreciated.

Michael Preiss
San Francisco, USA
mpreiss@sbcglobal.net