You might try to check the Hamburg passenger list database ("Hamburg Passenger Lists, 1850-1934") on Ancestry.com. If your ancestor left for Argentina on a ship from Hamburg (as one of my great grandmother's cousins did), he may be listed there. Be advised that the name spellings (and town of residence) would use German spelling.

Marion Werle <canadagenes@...>
Los Angeles, CA

"A uncle of my mother was a gaucho in Argentina but moved to Manchester UK to find a wife. We don't know where in eastern Europe he came from but assume he lived in one of the Hirsch  colonies in Argentina. Does anyone know of any searchable databases containing vital records, census or immigration data for the colonies?"