2 Mar 1974 - 30 April 1975
US foreign surface letter rate 18 c
Swedish foreign surface letter rate 100 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 100 rounded up to nearest 5 öre was normally paid by affixing stamps on the item.
Air mail letter with 21 c. Correct Rate 26 c. Due handstamp indicates double deficiency 10 c and foreign surface letter rate 18 c. Swedish due label indicates 10/18 of foreign surface letter rate 100 = 55.56 öre rounded up to 60 öre, paid by affixing a postage stamp on the item.