1 Jan 1967 to 30 April 1967
US foreign surface letter rate 11 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.
Unfranked air mail postcard. Correct rate 11 cent.
Shortpaid 11 cent. US due handstamp indicates double deficiency 2x11=22
cent and foreign surface letter rate 11 cent. Amount due in Sweden is 22/11
of foreign surface letter rate 70 öre = 140 öre. Postage stamps
for the amount due should have been affixed on the item, but the card may
have been refused or the the amount been paid in cash.