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

International letter with perfin "C.S.F." in the stamp. The letter is franked correctly with 40 øre, which was the rate [...]
International letter with perfin "C.S.F." in the stamps. The letter is franked correctly with 2 x 50 = 100 øre, [...]
Domestic letter with perfin "D.F." in the stamp. The letter is franked correctly with 10 øre, which was the rate [...]
Domestic post card with perfin "DRUBIN" in the stamp. The post card is franked correctly with 10 øre, which was [...]