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 [...]
International letter with perfin "39" in the stamp. The letter is franked correctly with 20 øre, which was the rate [...]
Parcel send by ferry with perfin "53" in the stamps. The letter is franked correctly with 1 kr + 50 [...]
International registered letter with perfin "66." in the stamp. The letter is franked correctly with 2 x 1 kr +30 [...]