You guessed correctly. The NZ health stamps and the Dutch "kinderpostzegels" (children's stamps are more or less the same. Surcharge for charity.
The stamps are sold door to door by children. I have done this as well when I was 10 years old.
The stamps you show are from the early 80s. Nothing very special, kust nice stamps.
They are nice, but I do not collect in that area, there are quite a few stamps in the albums that are from the Netherlands, I will probably sell them off as a bulk lot, just to recover the cost of the albums.
