HINDENBURG 12.5.1922 ZKr (119.6) on cover with single franking 2 Mark dark brown postage stamps issue smelting works and peace pigeon to Koenigshuette, stamp with perfin (perfin) "O. K. " (O. K. = Upper Silesian coal works and chemical Factories AG, Hindenburg, OS handbook number 13 b), height franking from the beginning phase the inflation period, transport traces