Hello,
here is the result from the Rotterdam Archives:
Rotterdam Akte Jaar 1850 Nummer a57
Bruidegom _Hermann Henrich Horstmann_
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=Hermann Henrich|| |
Horstmann)
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl) , Neuenkirchen (Hanover) , 28 Vader _Friederich Wilhelm
Horstmann_
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=Friederich Wilhelm|| | Horstmann) Moeder _Maria
Henriette Bröckers_
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=Maria Henriette|| | Bröckers) Bruid
_Johanna Elizabeth Hess_
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=Johanna Elizabeth|| | Hess)
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl) ,
Roterdam , 22 Vader _N.n. N.n._
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=N.n.|| | N.n.) Moeder _Henderika
Hess_
(http://rotterdam.digitalestamboom.nl/(f3zwgr55s24pen2bdp3b1fyf)/search.aspx?lang=nl&verder=Henderika|| | Hess) Plaats Rotterdam Huwelijksdatum
06-02-1850
So you can concentrate your researches on the Hannover area.
Good luck!
Brigitte