North Korea. (★). 4 complete sheets of stamps 1980's on toned unsurfaced thin greyish paper without gum. Not listed in Michel, but in Scott, valued to 5-10 $ a piece. Theese stamps was only for use inland, very hard to find. Mi no 2784 x 55, 2861 x 55, 2808 x 110 and 2667 x 110. aprox. 2500 $