International letter with perfin "NMF" in the stamp. The letter is franked correctly with 40 øre, which was the rate [...]

International letter with perfin "NMF" in the stamp. The letter is franked correctly with 40 øre, which was the rate [...]
Domestic COD with perfin "N.L." in the stamp. The COD is franked correctly with 30 øre, which was the rate [...]
Domestic letter with perfin "N.K.K." in the stamp. The letter is franked correctly with 15 øre, which was the rate [...]
International registered letter with perfin "N.D.&K." in the stamps. The letter is franked correctly with 2 x 15 + 2 [...]