1 Jul 1961 to 31 Dec 1965
US foreign surface letter rate 11 c
US Conversion rate 1 US cent = 3 goldcentimes
Swedish conversion rate 1 goldcentime = 1.7 öre
US handstamp shows amount to pay in goldcentimes, normally double deficiency.
In Sweden the indicated amount multiplied by 1.7 and rounded up to nearest 5 öre was marked on the item. The amount due was normally paid by affixing stamps on the item.
Air mail postcard with 8 cent. Correct rate 11
cent. US due handstamp indicates double deficiency 2x3x3=18 centimes. Amount
due in Sweden 1.7x18=30.6 öre rounded up to 35 öre. The amount
should normally have been affixed in postage stamps but the local postal
staff has probably tried to ignore the due and remove the due label.