1 May 1967 - 30 June 1971
US foreign surface letter rate 13 c
Swedish foreign surface letter rate 70 öre
US handstamp shows amount to pay in US cents (normally double deficiency) and US surface letter rate.
In Sweden the indicated fraction multiplied by 70 and rounded up to nearest 5 öre was normally paid by affixing stamps on the item.
Air mail postal
card. Correct rate 13 cent. Shortpaid 13 cent. US due handstamp indicates
double deficiency 2x13=26 cent and surface letter rate 13 cent. Amount
due in Sweden is 26/13 multiplied by Swedish foreign rate 70 öre =
140 öre. Stamps should normally have been affixed on the on the item
but no duee seems to have been paid in Sweden. An unfranked air item should
normally have been sent and charged as surface mail