Circular 26.5 mm
Colour: violet
170 öre rate period 1.2.1978-15.6.1980
Most typical use: Foreign letter paid at old letter rate.
Items known:
20.?.1979 Göteborg t o Königslutter(DE), violet
20.?.1979. Letter to Germany, correct fee 170 öre. Due handstamp indicated deficiency 30 öre and foreign letter rate 170 öre. No due markings made in Germany