Envelope (12½ cent) to Trondheim 15 April 1940 and printed matter (2½ cent) to Oslo 15 April 1940, both with label (slightly different) Terug afzender/ Postverbinding met/ Noorwegen tijdelijk/ verbroken. (back to sender, Postal connection with Norway temporarily severed), on April 9, German troops attacked Norway (operation Weserübung), small toned spot