/added 27 Sep 2007
Bell pot 18x20.5 mm
Colour: Violet
Items known:
10.2.1945 Surte to Schenectady NY (US), violet (57 1/7c)

10.2.1945 Air mail letter 5-10 grammes to USA. Correct rate surface fee 30 öre and air fee 130 öre; totally 160 öre. Amount due 2x40/1.40=57 1/7 centimes. There is no indication that the postage due has been charged in USA.