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 aafixing stamps on the item.
Letter with 5 cent. Correct rate 11 cent. Shortpaid 6 cent. US due handstamp indicates double deficiency 2x6x3=36 centimes. Amount due in Sweden 1.7x36=61,2 öre rounded up to 65 öre. Due may have been ignored by Swedish post office