Los-Nr. 6219

"25" Postage due charge mark (struck in Stockholm) on unpaid folded letter with contents sent from Copenhagen June 5th 1866 to Stockholm. According to the Danish/Swedish convention valid from October 1st 1865, the prepaid single rate was 17 öre but it was 25 öre when charged to the addressee. Also straight line cancel "OBETALDT." (Unpaid) on front. Transit cancels on reverse: "KJÖBENHAVN 5.6.1866" and "STOCKHOLM 1 TUR 8/6".