15 Pfg. (2) and 10 Pfg. Aufdruckdienstmarken on cover from BEUTHEN 7. 9. 20 with violet double circle. "commission INTERALLIÉE DE administrative district ET DE PLÉBISCITE DE HAUTE-SILÉSIE CONTROLE DE CERCLE BEUTHEN (BYTOM) VILLE" and German. Letter cancel "government agency BEUTHEN" to Wroclaw, small traces, extreme rare censorship stamp from Upper Silesia!