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.
Surface mail
letter. Correct rate 13 cent. Shortpaid 7 cent. US due handstamp indicates
double deficiency 2x7=14 cent and surface letter rate 13 cent. Amount due
in Sweden is 14/13 multiplied by Swedish foreign rate 70 öre = 75.38
öre rounded up to 80 öre. Stamps should normally have been affixed
on the on the item but the amount has probably been paid together with
other fees.