RYBNIK, 10 Pfg lilac-red, 40 Pfg lilac-red, 5 Mark dark sienna Officials July / October 1920 on folded letter / certificate-of-service form - simplified delivery to Lissek / Upper Silesia, double-circle RYBNIK 16 4 22 * * c (OS handbook No. 293.5), single-circle arrival mark LISSEK 26 4 22 (OS handbook No. 191.1), very neat postmark strikes, age and usage wear typical of the period.