/added 18 Dec 2005
Postage due items from USA to Sweden

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.

Air mail postcard with 13 cent. Correct rate 18 cent. Shortpaid 5 cent. US due handstamp indicates double deficiency 10 cent and foreign letter rate 18 cent. Swedish due 10/18 of 110 = 61.11 öre rounded up to 65 öre has been charged. The amount has paid by affixing a stamp on the item.