Domestic post card with perfin “NKT” in the stamps. The post card is franked correctly with 15 øre, which was the rate for post card from July 1st 1920 to March 31th 1926. The stamp is cancelled August 6th 1921 with a whole letter cancelation machine Tp. Sp. 4B. 5 * Bro II. The use of this cancellation stamp is 6 days earlier than know until now.