KATTOWITZ, 2 1/2 Pfg to 5 Mark Steelworks and Dove of Peace 1920 complete set on blank envelope, also red 10 Pfg charity stamp of "Lokalfonds Oberschlesien" (unlisted in OS handbook), double-circle KATTOWITZ 20 3 21 * (OBERSCHL.) l (OS handbook No. 141.33, plebiscite-day cancellation), rare cancel, age and use marks typical of period