Charl,
In Marktplaats there is a subsection for Oldtimers which has
quite a few older fongers. I think you are going to have to
search there for replacement parts, not sure.
Here is a 1930 Fongers from that subsection. There are alot of
1937 models (not sure why this year was so popular).
Knowing the Dutch terms (close to Afrikaans?) would help in the
search, neither of which I know enough of to be of much assistance.
Marty