Iternational post card (Stationary) with perfin “HBC” in the stamp. The letter is franked correctly as printed matter with 5 øre, the rate for international post card to Sweden from January 1st 1875 to June 31th 1920. The stationary is cancelled March 8th 1886 with København K Nr. 283, Kjøbenhavn KB LAP Iva-3
This is the earliest known use of this perfin.