40 öre, type I
1920-08-12--1920-10-16 Air mail
letter, by air Sweden-Germany, single rate
Letter rate: 20 öre (1875-07-01--1921-01-31)
Air mail fee: 20 öre (1920-08-12--1920-10-16)
40 öre, type II
1920-07-01--1921-06-30 Reg letter
outside Scandinavia, single rate
Letter rate 20 öre, (1875-07-01--1921-01-31)
Reg fee 20 öre ( 1920-07-01--1921-06-30)