Circular 27 mm
Colour: violet
70 öre rate period 1.1.1967-30.6.1971
Most typical use: Air mail cover to some countries in Africa and Central America 5-10 gr paid at surface rate
Items known:
23.8.1967 Göteborg to Montclair NJ (US), violet
23.8.1967 Air mail letter 20-25 grams to USA. Surface letter fee 110 öre, air mail fee 25 öre/5 grams, totally 235 öre. Shortpaid 55 öre. Due handstamp indicates double deficiency 110 öre and foreign letter rate 70 öre. US foreign rate was 13 c so amount due was 110/70x13=20.43 rounded up to 21 US cents.