8 Nov 1936 to 7 July 1940
US foreign surface letter rate 5 c
US Conversion rate 1 US cent = 5 goldcentimes
Swedish conversion rate 1 goldcentime = 1.2 öre
US handstamp shows amount to pay in goldcentimes, normally double deficiency.
In Sweden the indicated amount was multiplied by 1.2 rounded up to nearest 5 öre and marked on the item. The amount due was normally paid by affixing stamps on the item.
Double rate letter with 6 cent. Correct rate 8 cent. US due handstamp indicates double deficiency 2x2x5=20 centimes. Converted to öre at the rate 1.2, rounded up to 25 öre and paid by affixing stamp on the item.