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Based on the citizenship petition documents below:
Ship: Amsterdam
Port of Departure: Rotterdam, Holland
Date of Departure: ?
Port of Arrival: New York, NY
Date of Arrival: 4 September 1881
Even with this information, I have thus far been unable to locate additional emigration or ship information.
Declaration of Intention for Citizenship, 1934
Petition for Citizenship, 1937
Helen Schnell is the witness on the above document. It's probably his daughter-in-law, Helen, who was married to his son William. Nicholas's daughter Helen had died the year before, in 1936.