1 Feb 1976 to 28 Feb 1977
US foreign surface letter rate 18 c
Swedish foreign surface letter rate 130 öre
US handstamp shows amount missing in US cents and US surface letter rate.
In Sweden the indicated fraction multiplied by 130 rounded up to next 5 öre and a handling fee of 100 öre were normally paid by affixing stamps on an advice card sent along with item by the Swedish post office. Items handed out at the window or by rural carriers may have the amount due affixed on the item.
Air mail postcard with 15 cent. Correct rate 21 cent. Shotpaid 6 cent. US due handstamp indicates amount missing and foreign surface letter rate. Amount due in Sweden; 6/18 of foreign letter rate 130 öre = 43,33 öre rounded up to 45 öre and a handling fee of 100 öre, totally 145 öre, but no due seems to have been charged in Sweden.