1 Jul 1972 to 1 Mar 1974
US foreign surface letter rate 15 c
Swedish foreign surface letter rate 100 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 100 rounded up to nearest 5 öre was normally paid by affixing stamps on the item.

Air mail letter with 15 cent. Correct rate 21 cent. Shortpaid 6 cent. US due handstamp indicates double deficiency 12 cent and foreign letter rate 15 cent. 12/15 of 100 öre = 80 öre have been indicated by the due label and stamps for 80 öre have been affixed. This is a card but as it is oversized it has been taxed as letter.