Domestic registered letter with perfin “DP” in the stamp. The letter is franked correctly with 220 øre, 80 øre was the rate for domestic letter from June 1st 1971 to June 30th 1972 and the rate for registering was 140 øre from July 3rd 1967 to June 30th 1972. There is a 2nd franking with 50 øre which is a fee for submission to the postoffice outside the normal opening time. The stamp is cancelled November 1st 1971 22:30 with København 21.4 København 21.1 Bro Vd-5.
This letter is the only known with the perfin DP so far. And it’s also the only known with DP in position 5.