This page has photos of Christopher Korte (1848-1905), his second wife Frederika and their daugher Freida. The photo below the portrait of Christopher might be his first wife Mary.
Source - a large portrait held by Robert Korte, Gisborne and another copy from Hugh Drougemuller, Canada
First wife - Mary Korte ?
The portrait may be of second wife Frederika, based on likeness to other photos on this page, but others believe could be the first wife.
Source - From a large unlabeled portrait held by Robert Korte (Gisborne) and another copy from Hugh Drougemuller (Canada).
Second wife - Friederika Korte
Source - Trudy May, Hamilton