Domestic letter with perfin "21" in the stamps. The letter is franked correctly with 10 kr, which was the rate [...]

Domestic letter with perfin "21" in the stamps. The letter is franked correctly with 10 kr, which was the rate [...]
Domestic letter with perfin "B.T." in the stamp. The letter is franked correctly with 30 øre, which was the rate [...]
Domestic post card with perfin "W.H." in the stamp. The letter is franked correctly as printed matter with 5 øre, [...]
Domestic letter with perfin "RT" in the stamp. The letter is franked correctly with 30 øre, which was the rate [...]