I am looking for a connection with an August Hamann b. abt. 1837 married Marie (also found as Maria or Mary) b. abt. 1840 who ventured to New York from Bremen, Germany on the ship Kaiser Wilhelm der Grosse. They arrived in New York on 16 November 1904. Their last known address in Germany was in a city called "Gr. Zunder" or something to that effect.

If anyone can either help me with the city name or have these two individuals in their tree, please contact me.
Thank you!