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.
Oversized air mail card with 11 c. Taxed as air mail letter; correct air letter rate 15 cent. US due handstamp indicates double deficiency 2x3x4=24 centimes. Due in Sweden 1.7x24=40.8 öre rounded up to 45 öre. The amount has probably been paid in cash or the stamps have been affixed elsewhere.