Postzegel Nederland 1931 Koningin Wilhelmina en Industrie CreatorZwart, PietDate of creationmaart 1931Collection150 years of designs for the Dutch Postal Services in pictures
Postzegel Nederland 1931 Koningin Wilhelmina en schepen CreatorZwart, PietDate of creationjuli 1933Collection150 years of designs for the Dutch Postal Services in pictures
Postzegel Nederland 1931 Koningin Wilhelmina en vliegtuigen CreatorZwart, PietDate of creationmaart 1931Collection150 years of designs for the Dutch Postal Services in pictures