Single franking 300 M medium blue postage stamps issue 1923 on cover from Katowice (BEFORE THAT. Katowice) to Krolewska Huta (BEFORE THAT. Koenigshuette), ZKr KATOWICE 1 27.4.1923, propaganda adhesive label "SLASK / MUSI BYC / NASZ! " ( = Silesia must us appertain! ) at back, good condition, signed E. Krawcz TK