1 May 1975 - 31 Dec 1975
US foreign surface letter rate 18 c
Swedish foreign surface letter rate 110 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 110 and rounded up to nearest 5 öre was normally paid by affixing stamps on the item.
Letter with 10 cent. Correct rate 18 cent. Shortpaid
8 cent. US due handstamp indicates double deficiency 16 cent and foreign
letter rate 18 cent. Swedish due 16/18 of 110 = 97.78 öre rounded
up to 100 öre has been charged. The amount has probably been paid
together with other fees.