/added 23 Aug 2009
Postage due items from USA to Sweden
1 Feb 1977 - 31 Jan 1978
US foreign surface letter rate 18 c
Swedish foreign surface letter rate 140 öre
US handstamp shows amount missing in US cents and US surface letter rate.
In Sweden the indicated fraction multiplied by 140 rounded up to next 5 öre and a handling fee of 100 öre were normally paid by affixing stamps on an advice card sent along with item by the Swedish post office. Items handed out at the window or by rural carriers may have the amount due affixed on the item.

Air mail post card with 8 cent. Correct rate 21 cent. Shortpaid 13 cent. US due handstamp shows deficiency 13 cent and surface letter rate 18 cent. In Sweden 13/18 multiplied by foreign letter rate 140 = 101.11 öre rounded up to 105 öre and handling fee 100 öre, totally 205 öre have been charged. The amount due should be affixed on the enclosed due advice card which was returned to the post office.