STAMPS
1923
Netherlands, Silver jubilee, Wilhelmina design only
1930
Netherlands, Child welfare 6c
1933
Netherlands, William I of Orange 1.5c and 12.5c
1934
Netherlands, Crisis
Netherlands, Curaçao tercentenary
1935
Netherlands, Welfare stamps, 1.5c and 12.5c
1923
Netherlands, Silver jubilee, Wilhelmina design only
1930
1933
Netherlands, William I of Orange 1.5c and 12.5c
1934
Netherlands, Crisis
Netherlands, Curaçao tercentenary
1935
Netherlands, Welfare stamps, 1.5c and 12.5c
You will find Johannes Jacobus Warnaar's biography HERE.