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.
Second rate air mail letter with 15 cent. Correct
rate 30 cent. US due handstamp indicates double deficiency 2x3x15=90 centimes.
Due in Sweden 1.7x90=153 öre rounded up to 155 öre. The amount
has probably been paid in cash or the stamps have been affixed elsewhere.