1907. Fr. VIII, 5 øre, green. 2 copies on a “KORRESPONDANCEBREV” sent from Vejle to København 20.4.21. One stamp with perfin “D R-K.” (Danske Reklamekunst) and placed on a “VÆRDIMÆRKE” (3 øre) which after canc. could be reimburdes with one of the more than 200 diff. compagnies with advertisements inside the letter. Mounted on an exhibition page with detailed description. ONLY KNOWN COVER OF THIS KIND [ 54 ] [ ✉ ]