1953, 1 S. Plus 25 Gr. \"60 years labor movement\", proof in dark cobalt blue with black overprint sample, impeccable mint never hinged, expertized Matl and photo expertize Roger Soecknick VOeB (2022) : \"genuine and immaculate. It is this the hitherto first me known piece. \" (ANK. Number, . 996 P II)