Hello Graham,
Rudolf Grünewald died last year.
The homepage of the "Grünewald Zinnfiguren" has not been updated for a few years, since the grandson who had previously done so no longer had time for it.
The well-known engraver Rolf Grünewald, son of Rudolf, no longer carries the moulds on, but has dissolved the entire mould inventory.
Most of the moulds have already been sold, and others to "Glorius Empire", "Schmalkaldener Zinnfiguren", "Kettwiger Zinnfiguren" and others.
I don't think he's still interested in giving out more figures, especially since he doesn't have most of the characters at all.
Which characters are you looking for?
Many greetings
Christian