1 Jan 1966 to 31 Dec 1966
US foreign surface letter rate 11 c
Swedish foreign surface letter rate 60 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 60 and rounded up to nearest 5 öre was normally paid by affixing stamps on the item.

Customs fees for parcels 250 öre.  The postal rate books list customs fees of 150 öre for parcels 1 Jul 1964 to 28 Feb 1969. However the fee charged is normally higher so most probably the custom house porter fees (dragarpengar) have been added.