The "Monster Zonder Waarde" (sample without value) rates for the 1925 to 1946 period are shown in the table below.
November 1, 1929 - August 21, 1937 : 2c for each 50g (3c minimum)
Waginingen to Kimswerd, February 7, 1934
2c per 50g sample rate
3c paying the minimum rate