From the Family Search website, it appears there were records kept in Dutch at the point of embarkation. I am hoping to see if there is any different information than that contained in the passenger list in New York, including possible spelling variations on the name of my Grandfather and any additional information/data.
Below is an excerpt from the Family Search description of the record set and a link to the fuller description.
"Original records are available through the Rotterdam City Archive (Gemeentearchief te Rotterdam), Netherlands. This collection is being published as images become available. The text is handwritten in Dutch in a ledger type register. Passengers are listed by passage contract number.
"It was necessary to keep a record of all the passengers boarding on to the company’s different steamships traveling from the Netherlands to North America. These passenger lists are from the voyages of the Holland-America Line, a Dutch steamship company that covered transatlantic routes, mainly between the ports of Rotterdam and New York, and occasionally calling on the ports of Boulogne-sur-mer, Plymouth, Southampton, Boston and Halifax. The names of the vessels were: Potsdam, Rotterdam, Nieuw Amsterdam, Statendam, Ryndam, Veendam, and Volendam."
https://familysearch.org/learn/wiki/en/Netherlands,_Passenge...)