20 Jan 1950 to 31 Oct 1953
US foreign surface letter rate 5 c
US Conversion rate 1 US cent = 5 goldcentimes (during 1949 the US conversion rate changed to 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 was multiplied by 1.7 rounded up to nearest 5 öre and marked on the item. The amount due was normally paid by affixing stamps on the item.
Air mail letter with 6 cent. Correct rate 15 cent
(air mail cards were taxed at air mail letter rates). Shortpaid 9 cent.
US due handstamp shows double deficiency 2x9x3=54 centimes. Amount due
in Sweden 54x1.7=91.8 öre rounded up to 95 öre. No stamps have
been affixed on the item so the due may have been ignored or the item refused.